SyntaxFix

[ios] Determine device (iPhone, iPod Touch) with iOS

Is there a way to determine the device running an application. I want to distinguish between iPhone and iPod Touch, if possible.

This question is related to ios objective-c iphone ipod-touch

The answer is

To identifiy iPhone 4S, simply check the following:

var isIphone4S: Bool {

    let width = UIScreen.main.bounds.size.width
    let height = UIScreen.main.bounds.size.height
    let proportions = width > height ? width / height : height / width

    return proportions == 1.5 && UIDevice.current.model == "iPhone"
}

#import <sys/utsname.h> 

NSString *iPhone = [self iPhoneVersion]; 

-(NSString*)iPhoneVersion
{
   NSString *platform;
   struct utsname systemInfo;
   uname(&systemInfo);
   platform = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];

   if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 1G";
   if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
   if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
   if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
   if ([platform isEqualToString:@"iPhone3,3"])    return @"VerizoniPhone 4";
   if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
   if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5 (GSM)";
   if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
   if ([platform isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
   if ([platform isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
   if ([platform isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
   if ([platform isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
   if ([platform isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
   if ([platform isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
   if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
   if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
   if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
   if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
   if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch 5G";
   if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
   if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
   if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
   if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
   if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2 (WiFi)";
   if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
   if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini (GSM)";
   if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
   if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
   if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
   if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3 (GSM)";
   if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
   if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4 (GSM)";
   if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";
   if ([platform isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";
   if ([platform isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
   if ([platform isEqualToString:@"iPad4,3"])      return @"iPad Air";
   if ([platform isEqualToString:@"iPad4,4"])      return @"iPad Mini 2G (WiFi)";
   if ([platform isEqualToString:@"iPad4,5"])      return @"iPad Mini 2G (Cellular)";
   if ([platform isEqualToString:@"iPad4,6"])      return @"iPad Mini 2G";
   if ([platform isEqualToString:@"iPad4,7"])      return @"iPad Mini 3 (WiFi)";
   if ([platform isEqualToString:@"iPad4,8"])      return @"iPad Mini 3 (Cellular)";
   if ([platform isEqualToString:@"iPad4,9"])      return @"iPad Mini 3 (China)";
   if ([platform isEqualToString:@"iPad5,3"])      return @"iPad Air 2 (WiFi)";
   if ([platform isEqualToString:@"iPad5,4"])      return @"iPad Air 2 (Cellular)";
   if ([platform isEqualToString:@"AppleTV2,1"])   return @"Apple TV 2G";
   if ([platform isEqualToString:@"AppleTV3,1"])   return @"Apple TV 3";
   if ([platform isEqualToString:@"AppleTV3,2"])   return @"Apple TV 3 (2013)";
   if ([platform isEqualToString:@"i386"])         return @"Simulator";
   if ([platform isEqualToString:@"x86_64"])       return @"Simulator";
   return platform;
}

Here's a minor update with new models:

- (NSString *) platformString{
    NSString *platform = [self platform];
    if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 1G";
    if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
    if ([platform isEqualToString:@"iPod1,1"])   return @"iPod Touch 1G";
    if ([platform isEqualToString:@"iPod2,1"])   return @"iPod Touch 2G";
    if ([platform isEqualToString:@"iPod3,1"])   return @"iPod Touch 3G";
    if ([platform isEqualToString:@"i386"])   return @"iPhone Simulator";
    return platform;
}

I've created an extension that lets you to have 3 levels of identification:

  1. type of device
  2. type of iPhone/iPad by inch
  3. model of device

It updates with last iOS devices

UIDeviceDetector

How about this code, if new version was released, you will identifier with the last know device

- (NSString *)getModel {
    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);
    char *model = malloc(size);
    sysctlbyname("hw.machine", model, &size, NULL, 0);
    NSString *sDeviceModel = [NSString stringWithCString:model encoding:NSUTF8StringEncoding];
    free(model);                              
    if ([sDeviceModel isEqual:@"i386"])      return @"Simulator";  //iPhone Simulator
    if ([sDeviceModel isEqual:@"iPhone1,1"]) return @"iPhone1G";   //iPhone 1G
    if ([sDeviceModel isEqual:@"iPhone1,2"]) return @"iPhone3G";   //iPhone 3G
    if ([sDeviceModel isEqual:@"iPhone2,1"]) return @"iPhone3GS";  //iPhone 3GS
    if ([sDeviceModel isEqual:@"iPhone3,1"]) return @"iPhone3GS";  //iPhone 4 - AT&T
    if ([sDeviceModel isEqual:@"iPhone3,2"]) return @"iPhone3GS";  //iPhone 4 - Other carrier
    if ([sDeviceModel isEqual:@"iPhone3,3"]) return @"iPhone4";    //iPhone 4 - Other carrier
    if ([sDeviceModel isEqual:@"iPhone4,1"]) return @"iPhone4S";   //iPhone 4S
    if ([sDeviceModel isEqual:@"iPod1,1"])   return @"iPod1stGen"; //iPod Touch 1G
    if ([sDeviceModel isEqual:@"iPod2,1"])   return @"iPod2ndGen"; //iPod Touch 2G
    if ([sDeviceModel isEqual:@"iPod3,1"])   return @"iPod3rdGen"; //iPod Touch 3G
    if ([sDeviceModel isEqual:@"iPod4,1"])   return @"iPod4thGen"; //iPod Touch 4G
    if ([sDeviceModel isEqual:@"iPad1,1"])   return @"iPadWiFi";   //iPad Wifi
    if ([sDeviceModel isEqual:@"iPad1,2"])   return @"iPad3G";     //iPad 3G
    if ([sDeviceModel isEqual:@"iPad2,1"])   return @"iPad2";      //iPad 2 (WiFi)
    if ([sDeviceModel isEqual:@"iPad2,2"])   return @"iPad2";      //iPad 2 (GSM)
    if ([sDeviceModel isEqual:@"iPad2,3"])   return @"iPad2";      //iPad 2 (CDMA)

    NSString *aux = [[sDeviceModel componentsSeparatedByString:@","] objectAtIndex:0];

//If a newer version exist
    if ([aux rangeOfString:@"iPhone"].location!=NSNotFound) {
        int version = [[aux stringByReplacingOccurrencesOfString:@"iPhone" withString:@""] intValue];
        if (version == 3) return @"iPhone4"
        if (version >= 4) return @"iPhone4s";

    }
    if ([aux rangeOfString:@"iPod"].location!=NSNotFound) {
        int version = [[aux stringByReplacingOccurrencesOfString:@"iPod" withString:@""] intValue];
        if (version >=4) return @"iPod4thGen";
    }
    if ([aux rangeOfString:@"iPad"].location!=NSNotFound) {
        int version = [[aux stringByReplacingOccurrencesOfString:@"iPad" withString:@""] intValue];
        if (version ==1) return @"iPad3G";
        if (version >=2) return @"iPad2";
    }
    //If none was found, send the original string
    return sDeviceModel;
}

if([UIDevice currentDevice].userInterfaceIdiom==UIUserInterfaceIdiomPad) {
    //Device is ipad 
}else{
    //Device is iphone
}

Answer in Swift 3,

struct DeviceInformation {
    // UIDevice.current.model's value is "iPhone" or "iPad",which does not include details; the following "model" is detailed, such as, iPhone7,1 is actually iPhone 6 plus
    static let model: String = {
        var size = 0
        sysctlbyname("hw.machine", nil, &size, nil, 0)
        var machine = [CChar](repeating: 0,  count: Int(size))
        sysctlbyname("hw.machine", &machine, &size, nil, 0)
        return String(cString: machine)
    }()

    static let uuid = UIDevice.current.identifierForVendor?.uuidString ?? ""
    static let idForAdService = ASIdentifierManager.shared().advertisingIdentifier.uuidString

    static func diviceTypeReadableName() -> String {
        switch model {
        case "iPhone1,1":   return "iPhone 1G"
        case "iPhone1,2":   return "iPhone 3G"
        case "iPhone2,1":   return "iPhone 3GS"
        case "iPhone3,1":   return "iPhone 4"
        case "iPhone3,3":   return "iPhone 4 (Verizon)"
        case "iPhone4,1":   return "iPhone 4S"
        case "iPhone5,1":   return "iPhone 5 (GSM)"
        case "iPhone5,2":   return "iPhone 5 (GSM+CDMA)"
        case "iPhone5,3":   return "iPhone 5c (GSM)"
        case "iPhone5,4":   return "iPhone 5c (GSM+CDMA)"
        case "iPhone6,1":   return "iPhone 5s (GSM)"
        case "iPhone6,2":   return "iPhone 5s (GSM+CDMA)"
        case "iPhone7,2":   return "iPhone 6"
        case "iPhone7,1":   return "iPhone 6 Plus"
        case "iPhone8,1":   return "iPhone 6s"
        case "iPhone8,2":   return "iPhone 6s Plus"
        case "iPhone8,4":   return "iPhone SE"
        case "iPhone9,1":   return "iPhone 7"
        case "iPhone9,3":   return "iPhone 7"
        case "iPhone9,2":   return "iPhone 7 Plus"
        case "iPhone9,4":   return "iPhone 7 Plus"
        case "iPod1,1":     return "iPod Touch 1G"
        case "iPod2,1":     return "iPod Touch 2G"
        case "iPod3,1":     return "iPod Touch 3G"
        case "iPod4,1":     return "iPod Touch 4G"
        case "iPod5,1":     return "iPod Touch 5G"
        case "iPod7,1":     return "iPod Touch 6G"
        case "iPad1,1":     return "iPad 1G"
        case "iPad2,1":     return "iPad 2 (Wi-Fi)"
        case "iPad2,2":     return "iPad 2 (GSM)"
        case "iPad2,3":     return "iPad 2 (CDMA)"
        case "iPad2,4":     return "iPad 2 (Wi-Fi)"
        case "iPad2,5":     return "iPad Mini (Wi-Fi)"
        case "iPad2,6":     return "iPad Mini (GSM)"
        case "iPad2,7":     return "iPad Mini (GSM+CDMA)"
        case "iPad3,1":     return "iPad 3 (Wi-Fi)"
        case "iPad3,2":     return "iPad 3 (GSM+CDMA)"
        case "iPad3,3":     return "iPad 3 (GSM)"
        case "iPad3,4":     return "iPad 4 (Wi-Fi)"
        case "iPad3,5":     return "iPad 4 (GSM)"
        case "iPad3,6":     return "iPad 4 (GSM+CDMA)"
        case "iPad4,1":     return "iPad Air (Wi-Fi)"
        case "iPad4,2":     return "iPad Air (Cellular)"
        case "iPad4,3":     return "iPad Air (China)"
        case "iPad4,4":     return "iPad Mini 2G (Wi-Fi)"
        case "iPad4,5":     return "iPad Mini 2G (Cellular)"
        case "iPad4,6":     return "iPad Mini 2G (China)"
        case "iPad4,7":     return "iPad Mini 3 (Wi-Fi)"
        case "iPad4,8":     return "iPad Mini 3 (Cellular)"
        case "iPad4,9":     return "iPad Mini 3 (China)"
        case "iPad5,1":     return "iPad Mini 4 (Wi-Fi)"
        case "iPad5,2":     return "iPad Mini 4 (Cellular)"
        case "iPad5,3":     return "iPad Air 2 (Wi-Fi)"
        case "iPad5,4":     return "iPad Air 2 (Cellular)"
        case "iPad6,3":     return "iPad Pro 9.7' (Wi-Fi)"
        case "iPad6,4":     return "iPad Pro 9.7' (Cellular)"
        case "iPad6,7":     return "iPad Pro 12.9' (Wi-Fi)"
        case "iPad6,8":     return "iPad Pro 12.9' (Cellular)"
        case "AppleTV2,1":  return "Apple TV 2G"
        case "AppleTV3,1":  return "Apple TV 3"
        case "AppleTV3,2":  return "Apple TV 3 (2013)"
        case "AppleTV5,3":  return "Apple TV 4"
        case "Watch1,1":    return "Apple Watch Series 1 (38mm, S1)"
        case "Watch1,2":    return "Apple Watch Series 1 (42mm, S1)"
        case "Watch2,6":    return "Apple Watch Series 1 (38mm, S1P)"
        case "Watch2,7":    return "Apple Watch Series 1 (42mm, S1P)"
        case "Watch2,3":    return "Apple Watch Series 2 (38mm, S2)"
        case "Watch2,4":    return "Apple Watch Series 2 (42mm, S2)"
        case "i386":        return "Simulator"
        case "x86_64":      return "Simulator"

        default:
            return ""
        }
    }
}

Please feel free to use this class (gist @ github)

CODE REMOVED AND RELOCATED TO

https://gist.github.com/1323251

UPDATE (01/14/11)

Obviously, this code is a bit out of date by now, but it can certainly be updated using the code on this thread provided by Brian Robbins which includes similar code with updated models. Thanks for the support on this thread.

Updated platform strings for iPad Air 2 and iPad mini 3:

- (NSString *)platformString
{
    NSString *platform = [self platform];

    if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 1G";
    if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,3"])    return @"Verizon iPhone 4";
    if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
    if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5 (GSM)";
    if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
    if ([platform isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
    if ([platform isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
    if ([platform isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
    if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
    if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
    if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
    if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
    if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch 5G";
    if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
    if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
    if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
    if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini (GSM)";
    if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
    if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3 (GSM)";
    if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
    if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4 (GSM)";
    if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";

    if ([platform isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
    if ([platform isEqualToString:@"iPad4,4"])      return @"iPad mini 2G (WiFi)";
    if ([platform isEqualToString:@"iPad4,5"])      return @"iPad mini 2G (Cellular)";

    if ([platform isEqualToString:@"iPad4,7"])      return @"iPad mini 3 (WiFi)";
    if ([platform isEqualToString:@"iPad4,8"])      return @"iPad mini 3 (Cellular)";
    if ([platform isEqualToString:@"iPad4,9"])      return @"iPad mini 3 (China Model)";

    if ([platform isEqualToString:@"iPad5,3"])      return @"iPad Air 2 (WiFi)";
    if ([platform isEqualToString:@"iPad5,4"])      return @"iPad Air 2 (Cellular)";
    if ([platform isEqualToString:@"iPad6,8"])      return @"iPad Pro";

    if ([platform isEqualToString:@"i386"])         return @"Simulator";
    if ([platform isEqualToString:@"x86_64"])       return @"Simulator";

    return platform;
}

There's a pretty mature library (by me) for that called SDVersion. You can check for running device's model, screen size and many other parameters. It also supports OSX.

Example: 

      // Check for device model
      if ([SDVersion deviceVersion] == iPhone6)
           NSLog(@"You got the iPhone 6. Sweet !");
      else if ([SDVersion deviceVersion] == iPhone6Plus)
           NSLog(@"iPhone 6 Plus? Bigger is better!");
      else if ([SDVersion deviceVersion] == iPadAir2)
           NSLog(@"You own an iPad Air 2 !");

      // Check for device screen size
      if ([SDVersion deviceSize] == Screen4inch)
           NSLog(@"Your screen is 4 inches");

I took it a bit further and converted the big "isEqualToString" block into a classification of bit masks for the device type, the generation, and that other qualifier after the comma (I'm calling it the sub generation). It is wrapped in a class with a singleton call SGPlatform which avoids a lot of repetitive string operations. Code is available https://github.com/danloughney/spookyGroup

The class lets you do things like this:

if ([SGPlatform iPad] && [SGPlatform generation] > 3) {
    // set for high performance
}

and 

switch ([SGPlatform deviceMask]) {
case DEVICE_IPHONE:
    break;
case DEVICE_IPAD:
    break;
case DEVICE_IPAD_MINI:
    break;
}

The classification of the devices is in the platformBits method. That method should be very familiar to the readers of this thread. I have classified the devices by their type and generation because I'm mostly interested in the overall performance, but the source can be tweaked to provide any classification that you are interested in, retina screen, networking capabilities, etc..

For simple comparison I always like macro:

#define IS_IPOD [[UIDevice currentDevice].model containsString:@"iPod"]
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)

It's simple and easy to use.

Latest update - November 2020: Added iPhone 12, iPhone 12 mini iPhone 12 Pro, iPhone 12 Pro Max, iPhone SE (2nd generation), iPad (8th generation), iPad Air (4th generation), Apple Watch 6, Apple Watch SE

Previous update - June 2020: Added iPad Pro 11 2020 (2nd generation), iPad Pro 12.9 2020 (4th generation), Apple Watch 5

Swift

(Tested on Swift 5, Swift 4, Swift 3)

The function below returns a string with current device name.

func userDeviceName() -> String {
    let platform: String = {
        var size = 0
        sysctlbyname("hw.machine", nil, &size, nil, 0)
        var machine = [CChar](repeating: 0,  count: Int(size))
        sysctlbyname("hw.machine", &machine, &size, nil, 0)
        return String(cString: machine)
    }()
    
    //iPhone
    if platform == "iPhone1,1"        { return "iPhone (1st generation)" }
    else if platform == "iPhone1,2"   { return "iPhone 3G" }
    else if platform == "iPhone2,1"   { return "iPhone 3GS" }
    else if platform == "iPhone3,1"   { return "iPhone 4 (GSM)" }
    else if platform == "iPhone3,2"   { return "iPhone 4 (GSM, 2nd revision)" }
    else if platform == "iPhone3,3"   { return "iPhone 4 (CDMA)" }
    else if platform == "iPhone4,1"   { return "iPhone 4S" }
    else if platform == "iPhone5,1"   { return "iPhone 5 (GSM)" }
    else if platform == "iPhone5,2"   { return "iPhone 5 (GSM+CDMA)" }
    else if platform == "iPhone5,3"   { return "iPhone 5c (GSM)" }
    else if platform == "iPhone5,4"   { return "iPhone 5c (GSM+CDMA)" }
    else if platform == "iPhone6,1"   { return "iPhone 5s (GSM)" }
    else if platform == "iPhone6,2"   { return "iPhone 5s (GSM+CDMA)" }
    else if platform == "iPhone7,2"   { return "iPhone 6" }
    else if platform == "iPhone7,1"   { return "iPhone 6 Plus" }
    else if platform == "iPhone8,1"   { return "iPhone 6s" }
    else if platform == "iPhone8,2"   { return "iPhone 6s Plus" }
    else if platform == "iPhone8,4"   { return "iPhone SE" }
    else if platform == "iPhone9,1"   { return "iPhone 7 (GSM+CDMA)" }
    else if platform == "iPhone9,3"   { return "iPhone 7 (GSM)" }
    else if platform == "iPhone9,2"   { return "iPhone 7 Plus (GSM+CDMA)" }
    else if platform == "iPhone9,4"   { return "iPhone 7 Plus (GSM)" }
    else if platform == "iPhone10,1"  { return "iPhone 8 (GSM+CDMA)" }
    else if platform == "iPhone10,4"  { return "iPhone 8 (GSM)" }
    else if platform == "iPhone10,2"  { return "iPhone 8 Plus (GSM+CDMA)" }
    else if platform == "iPhone10,5"  { return "iPhone 8 Plus (GSM)" }
    else if platform == "iPhone10,3"  { return "iPhone X (GSM+CDMA)" }
    else if platform == "iPhone10,6"  { return "iPhone X (GSM)" }
    else if platform == "iPhone11,2"  { return "iPhone XS" }
    else if platform == "iPhone11,6"  { return "iPhone XS Max" }
    else if platform == "iPhone11,8"  { return "iPhone XR" }
    else if platform == "iPhone12,1"  { return "iPhone 11" }
    else if platform == "iPhone12,3"  { return "iPhone 11 Pro" }
    else if platform == "iPhone12,5"  { return "iPhone 11 Pro Max" }
    else if platform == "iPhone12,8"  { return "iPhone SE (2nd generation)" }
    else if platform == "iPhone13,1"  { return "iPhone 12 mini" }
    else if platform == "iPhone13,2"  { return "iPhone 12" }
    else if platform == "iPhone13,3"  { return "iPhone 12 Pro" }
    else if platform == "iPhone13,4"  { return "iPhone 12 Pro Max" }
        
        //iPod Touch
    else if platform == "iPod1,1"     { return "iPod Touch (1st generation)" }
    else if platform == "iPod2,1"     { return "iPod Touch (2nd generation)" }
    else if platform == "iPod3,1"     { return "iPod Touch (3rd generation)" }
    else if platform == "iPod4,1"     { return "iPod Touch (4th generation)" }
    else if platform == "iPod5,1"     { return "iPod Touch (5th generation)" }
    else if platform == "iPod7,1"     { return "iPod Touch (6th generation)" }
    else if platform == "iPod9,1"     { return "iPod Touch (7th generation) (2019)" }
        
        //iPad
    else if platform == "iPad1,1"     { return "iPad (1st generation)" }
    else if platform == "iPad2,1"     { return "iPad 2 (Wi-Fi)" }
    else if platform == "iPad2,2"     { return "iPad 2 (GSM)" }
    else if platform == "iPad2,3"     { return "iPad 2 (CDMA)" }
    else if platform == "iPad2,4"     { return "iPad 2 (Wi-Fi, Mid 2012)" }
    else if platform == "iPad3,1"     { return "iPad (3rd generation) (Wi-Fi)" }
    else if platform == "iPad3,2"     { return "iPad (3rd generation) (GSM+CDMA)" }
    else if platform == "iPad3,3"     { return "iPad (3rd generation) (GSM)" }
    else if platform == "iPad3,4"     { return "iPad (4th generation) (Wi-Fi)"}
    else if platform == "iPad3,5"     { return "iPad (4th generation) (GSM)" }
    else if platform == "iPad3,6"     { return "iPad (4th generation) (GSM+CDMA)" }
    else if platform == "iPad6,11"    { return "iPad (5th generation) (Wi-Fi)" }
    else if platform == "iPad6,12"    { return "iPad (5th generation) (Cellular)" }
    else if platform == "iPad7,5"     { return "iPad (6th generation) (2018) (Wi-Fi)" }
    else if platform == "iPad7,6"     { return "iPad (6th generation) (2018) (Cellular)" }
    else if platform == "iPad7,11"    { return "iPad (7th generation) (2019) (Wi-Fi)" }
    else if platform == "iPad7,12"    { return "iPad (7th generation) (2019) (Cellular)" }
    else if platform == "iPad11,6"    { return "iPad (8th generation) (2020) (Wi-Fi)" }
    else if platform == "iPad11,7"    { return "iPad (8th generation) (2020) (Cellular)" }
        
        //iPad Air
    else if platform == "iPad4,1"     { return "iPad Air (Wi-Fi)" }
    else if platform == "iPad4,2"     { return "iPad Air (Cellular)" }
    else if platform == "iPad4,3"     { return "iPad Air (China)" }
    else if platform == "iPad5,3"     { return "iPad Air 2 (Wi-Fi)" }
    else if platform == "iPad5,4"     { return "iPad Air 2 (Cellular)" }
    else if platform == "iPad11,3"    { return "iPad Air (3rd generation) (2019) (Wi-Fi)" }
    else if platform == "iPad11,4"    { return "iPad Air (3rd generation) (2019) (Cellular)" }
    else if platform == "iPad13,1"    { return "iPad Air (4th generation) (2020) (Wi-Fi)" }
    else if platform == "iPad13,2"    { return "iPad Air (4th generation) (2020) (Cellular)" }
        
        //iPad Pro
    else if platform == "iPad6,3"     { return "iPad Pro 9.7\" (Wi-Fi)" }
    else if platform == "iPad6,4"     { return "iPad Pro 9.7\" (Cellular)" }
    else if platform == "iPad6,7"     { return "iPad Pro 12.9\" (Wi-Fi)" }
    else if platform == "iPad6,8"     { return "iPad Pro 12.9\" (Cellular)" }
    else if platform == "iPad7,1"     { return "iPad Pro 12.9\" (2nd generation) (Wi-Fi)" }
    else if platform == "iPad7,2"     { return "iPad Pro 12.9\" (2nd generation) (Cellular)" }
    else if platform == "iPad7,3"     { return "iPad Pro 10.5\" (Wi-Fi)" }
    else if platform == "iPad7,4"     { return "iPad Pro 10.5\" (Cellular)" }
    else if platform == "iPad8,1"     { return "iPad Pro 11\" (2018) (Wi-Fi)" }
    else if platform == "iPad8,2"     { return "iPad Pro 11\" (2018) (Wi-Fi, 1TB)" }
    else if platform == "iPad8,3"     { return "iPad Pro 11\" (2018) (Cellular)" }
    else if platform == "iPad8,4"     { return "iPad Pro 11\" (2018) (Cellular 1TB)" }
    else if platform == "iPad8,5"     { return "iPad Pro 12.9\" (3rd generation) (2018) (Wi-Fi)" }
    else if platform == "iPad8,6"     { return "iPad Pro 12.9\" (3rd generation) (2018) (Cellular)" }
    else if platform == "iPad8,7"     { return "iPad Pro 12.9\" (3rd generation) (2018) (Wi-Fi, 1TB)" }
    else if platform == "iPad8,8"     { return "iPad Pro 12.9\" (3rd generation) (2018) (Cellular, 1TB)" }
    else if platform == "iPad8,9"     { return "iPad Pro 11\" (2nd generation) (2020) (Wi-Fi)" }
    else if platform == "iPad8,10"    { return "iPad Pro 11\" (2nd generation) (2020) (Cellular)" }
    else if platform == "iPad8,11"    { return "iPad Pro 12.9\" (4th generation) (2020) (Wi-Fi)" }
    else if platform == "iPad8,12"    { return "iPad Pro 12.9\" (4th generation) (2020) (Cellular)" }
        
        //iPad Mini
    else if platform == "iPad2,5"     { return "iPad mini (Wi-Fi)" }
    else if platform == "iPad2,6"     { return "iPad mini (GSM)" }
    else if platform == "iPad2,7"     { return "iPad mini (GSM+CDMA)" }
    else if platform == "iPad4,4"     { return "iPad mini 2 (Wi-Fi)" }
    else if platform == "iPad4,5"     { return "iPad mini 2 (Cellular)" }
    else if platform == "iPad4,6"     { return "iPad mini 2 (China)" }
    else if platform == "iPad4,7"     { return "iPad mini 3 (Wi-Fi)" }
    else if platform == "iPad4,8"     { return "iPad mini 3 (Cellular)" }
    else if platform == "iPad4,9"     { return "iPad mini 3 (China)" }
    else if platform == "iPad5,1"     { return "iPad mini 4 (Wi-Fi)" }
    else if platform == "iPad5,2"     { return "iPad mini 4 (Cellular)" }
    else if platform == "iPad11,1"    { return "iPad mini (5th generation) (2019) (Wi-Fi)" }
    else if platform == "iPad11,2"    { return "iPad mini (5th generation) (2019) (Cellular)" }
        
        //Apple TV
    else if platform == "AppleTV2,1"  { return "Apple TV 2G" }
    else if platform == "AppleTV3,1"  { return "Apple TV 3" }
    else if platform == "AppleTV3,2"  { return "Apple TV 3 (2013)" }
    else if platform == "AppleTV5,3"  { return "Apple TV 4" }
    else if platform == "AppleTV6,2"  { return "Apple TV 4K" }
        
        //Apple Watch
    else if platform == "Watch1,1"    { return "Apple Watch (1st generation) (38mm)" }
    else if platform == "Watch1,2"    { return "Apple Watch (1st generation) (42mm)" }
    else if platform == "Watch2,6"    { return "Apple Watch Series 1 (38mm)" }
    else if platform == "Watch2,7"    { return "Apple Watch Series 1 (42mm)" }
    else if platform == "Watch2,3"    { return "Apple Watch Series 2 (38mm)" }
    else if platform == "Watch2,4"    { return "Apple Watch Series 2 (42mm)" }
    else if platform == "Watch3,1"    { return "Apple Watch Series 3 (38mm Cellular)" }
    else if platform == "Watch3,2"    { return "Apple Watch Series 3 (42mm Cellular)" }
    else if platform == "Watch3,3"    { return "Apple Watch Series 3 (38mm)" }
    else if platform == "Watch3,4"    { return "Apple Watch Series 3 (42mm)" }
    else if platform == "Watch4,1"    { return "Apple Watch Series 4 (40mm)" }
    else if platform == "Watch4,2"    { return "Apple Watch Series 4 (44mm)" }
    else if platform == "Watch4,3"    { return "Apple Watch Series 4 (40mm Cellular)" }
    else if platform == "Watch4,4"    { return "Apple Watch Series 4 (44mm Cellular)" }
    else if platform == "Watch5,1"    { return "Apple Watch Series 5 (40mm)" }
    else if platform == "Watch5,2"    { return "Apple Watch Series 5 (44mm)" }
    else if platform == "Watch5,3"    { return "Apple Watch Series 5 (40mm Cellular)" }
    else if platform == "Watch5,4"    { return "Apple Watch Series 5 (44mm Cellular)" }
    else if platform == "Watch6,1"    { return "Apple Watch Series 6 (40mm)" }
    else if platform == "Watch6,2"    { return "Apple Watch Series 6 (44mm)" }
    else if platform == "Watch6,3"    { return "Apple Watch Series 6 (40mm Cellular)" }
    else if platform == "Watch6,4"    { return "Apple Watch Series 6 (44mm Cellular)" }
    else if platform == "Watch5,9"    { return "Apple Watch SE (40mm)" }
    else if platform == "Watch5,10"   { return "Apple Watch SE (44mm)" }
    else if platform == "Watch5,11"   { return "Apple Watch SE (40mm Cellular)" }
    else if platform == "Watch5,12"   { return "Apple Watch SE (44mm Cellular)" }
        
        //Simulator
    else if platform == "i386"        { return "Simulator" }
    else if platform == "x86_64"      { return "Simulator"}
    
    return platform
}

You can test it using following code:

print("Current device is: ", self.userDeviceName())

Objective-C

I also added new devices to the Objective-C code

Don't forget to import sys/sysctl.h

     #import <sys/sysctl.h>  
           
            
- (NSString *) userDeviceName {
    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);
    char *machine = malloc(size);
    sysctlbyname("hw.machine", machine, &size, NULL, 0);
    NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];
    
    free(machine);
    
        //iPhone
        if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone (1st generation)";
        if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
        if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
        if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4 (GSM)";
        if ([platform isEqualToString:@"iPhone3,2"])    return @"iPhone 4 (GSM, 2nd revision)";
        if ([platform isEqualToString:@"iPhone3,3"])    return @"iPhone 4 (Verizon)";
        if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
        if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5 (GSM)";
        if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
        if ([platform isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
        if ([platform isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
        if ([platform isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
        if ([platform isEqualToString:@"iPhone8,1"])    return @"iPhone 6s";
        if ([platform isEqualToString:@"iPhone8,2"])    return @"iPhone 6s Plus";
        if ([platform isEqualToString:@"iPhone8,4"])    return @"iPhone SE";
        if ([platform isEqualToString:@"iPhone9,1"])    return @"iPhone 7 (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone9,3"])    return @"iPhone 7 (GSM)";
        if ([platform isEqualToString:@"iPhone9,2"])    return @"iPhone 7 Plus (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone9,4"])    return @"iPhone 7 Plus (GSM)";
        if ([platform isEqualToString:@"iPhone10,1"])   return @"iPhone 8 (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone10,4"])   return @"iPhone 8 (GSM)";
        if ([platform isEqualToString:@"iPhone10,2"])   return @"iPhone 8 Plus (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone10,5"])   return @"iPhone 8 Plus (GSM)";
        if ([platform isEqualToString:@"iPhone10,3"])   return @"iPhone X (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone10,6"])   return @"iPhone X (GSM)";
        if ([platform isEqualToString:@"iPhone11,2"])   return @"iPhone XS";
        if ([platform isEqualToString:@"iPhone11,6"])   return @"iPhone XS Max";
        if ([platform isEqualToString:@"iPhone11,8"])   return @"iPhone XR";
        if ([platform isEqualToString:@"iPhone12,1"])   return @"iPhone 11";
        if ([platform isEqualToString:@"iPhone12,3"])   return @"iPhone 11 Pro";
        if ([platform isEqualToString:@"iPhone12,5"])   return @"iPhone 11 Pro Max";
        if ([platform isEqualToString:@"iPhone12,8"])   return @"iPhone SE (2nd generation)";
        if ([platform isEqualToString:@"iPhone13,1"])   return @"iPhone 12 mini";
        if ([platform isEqualToString:@"iPhone13,2"])   return @"iPhone 12";
        if ([platform isEqualToString:@"iPhone13,3"])   return @"iPhone 12 Pro";
        if ([platform isEqualToString:@"iPhone13,4"])   return @"iPhone 12 Pro Max";
        
        //iPod Touch
        if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch (1st generation)";
        if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch (2nd generation)";
        if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch (3rd generation)";
        if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch (4th generation)";
        if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch (5th generation)";
        if ([platform isEqualToString:@"iPod7,1"])      return @"iPod Touch (6th generation)";
        if ([platform isEqualToString:@"iPod9,1"])      return @"iPod Touch (7th generation) (2019)";
        
        //iPad
        if ([platform isEqualToString:@"iPad1,1"])      return @"iPad (1st generation)";
        if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (Wi-Fi)";
        if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
        if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
        if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2 (Wi-Fi, Mid 2012)";
        if ([platform isEqualToString:@"iPad3,1"])      return @"iPad (3rd generation) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad3,2"])      return @"iPad (3rd generation) (GSM+CDMA)";
        if ([platform isEqualToString:@"iPad3,3"])      return @"iPad (3rd generation) (GSM)";
        if ([platform isEqualToString:@"iPad3,4"])      return @"iPad (4th generation) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad3,5"])      return @"iPad (4th generation) (GSM)";
        if ([platform isEqualToString:@"iPad3,6"])      return @"iPad (4th generation) (GSM+CDMA)";
        if ([platform isEqualToString:@"iPad6,11"])     return @"iPad (5th generation) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad6,12"])     return @"iPad (5th generation) (Cellular)";
        if ([platform isEqualToString:@"iPad7,5"])      return @"iPad (6th generation) (2018) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad7,6"])      return @"iPad (6th generation) (2018) (Cellular)";
        if ([platform isEqualToString:@"iPad7,11"])     return @"iPad (7th generation) (2019) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad7,12"])     return @"iPad (7th generation) (2019) (Cellular)";
        if ([platform isEqualToString:@"iPad11,6"])     return @"iPad (8th generation) (2020) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad11,7"])     return @"iPad (8th generation) (2020) (Cellular)";
        
        //iPad Air
        if ([platform isEqualToString:@"iPad4,1"])      return @"iPad Air (Wi-Fi)";
        if ([platform isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
        if ([platform isEqualToString:@"iPad4,3"])      return @"iPad Air (China)";
        if ([platform isEqualToString:@"iPad5,3"])      return @"iPad Air 2 (Wi-Fi)";
        if ([platform isEqualToString:@"iPad5,4"])      return @"iPad Air 2 (Cellular)";
        if ([platform isEqualToString:@"iPad11,3"])     return @"iPad Air (3rd generation) (2019) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad11,4"])     return @"iPad Air (3rd generation) (2019) (Cellular)";
        if ([platform isEqualToString:@"iPad13,1"])     return @"iPad Air (4th generation) (2020) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad13,2"])     return @"iPad Air (4th generation) (2020) (Cellular)";
        
        //iPad Pro
        if ([platform isEqualToString:@"iPad6,3"])      return @"iPad Pro 9.7\" (Wi-Fi)";
        if ([platform isEqualToString:@"iPad6,4"])      return @"iPad Pro 9.7\" (Cellular)";
        if ([platform isEqualToString:@"iPad6,7"])      return @"iPad Pro 12.9\" (Wi-Fi)";
        if ([platform isEqualToString:@"iPad6,8"])      return @"iPad Pro 12.9\" (Cellular)";
        if ([platform isEqualToString:@"iPad7,1"])      return @"iPad Pro 12.9\" (2nd generation) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad7,2"])      return @"iPad Pro 12.9\" (2nd generation) (Cellular)";
        if ([platform isEqualToString:@"iPad7,3"])      return @"iPad Pro 10.5\" (Wi-Fi)";
        if ([platform isEqualToString:@"iPad7,4"])      return @"iPad Pro 10.5\" (Cellular)";
        if ([platform isEqualToString:@"iPad8,1"])      return @"iPad Pro 11\" (2018) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad8,2"])      return @"iPad Pro 11\" (2018) (Wi-Fi, 1TB)";
        if ([platform isEqualToString:@"iPad8,3"])      return @"iPad Pro 11\" (2018) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad8,4"])      return @"iPad Pro 11\" (2018) (Cellular)";
        if ([platform isEqualToString:@"iPad8,5"])      return @"iPad Pro 12.9\" (3rd generation) (2018) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad8,6"])      return @"iPad Pro 12.9\" (3rd generation) (2018) (Cellular)";
        if ([platform isEqualToString:@"iPad8,7"])      return @"iPad Pro 12.9\" (3rd generation) (2018) (Wi-Fi, 1TB)";
        if ([platform isEqualToString:@"iPad8,8"])      return @"iPad Pro 12.9\" (3rd generation) (2018) (Cellular, 1TB)";
        if ([platform isEqualToString:@"iPad8,9"])      return @"iPad Pro 11\" (2nd generation) (2020) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad8,10"])     return @"iPad Pro 11\" (2nd generation) (2020) (Cellular)";
        if ([platform isEqualToString:@"iPad8,11"])     return @"iPad Pro 12.9\" (4th generation) (2020) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad8,12"])     return @"iPad Pro 12.9\" (4th generation) (2020) (Cellular)";
        
        //iPad mini
        if ([platform isEqualToString:@"iPad2,5"])      return @"iPad mini (Wi-Fi)";
        if ([platform isEqualToString:@"iPad2,6"])      return @"iPad mini (GSM)";
        if ([platform isEqualToString:@"iPad2,7"])      return @"iPad mini (GSM+CDMA)";
        if ([platform isEqualToString:@"iPad4,4"])      return @"iPad mini 2 (Wi-Fi)";
        if ([platform isEqualToString:@"iPad4,5"])      return @"iPad mini 2 (Cellular)";
        if ([platform isEqualToString:@"iPad4,6"])      return @"iPad mini 2 (China)";
        if ([platform isEqualToString:@"iPad4,7"])      return @"iPad mini 3 (Wi-Fi)";
        if ([platform isEqualToString:@"iPad4,8"])      return @"iPad mini 3 (Cellular)";
        if ([platform isEqualToString:@"iPad4,9"])      return @"iPad mini 3 (China)";
        if ([platform isEqualToString:@"iPad5,1"])      return @"iPad mini 4 (Wi-Fi)";
        if ([platform isEqualToString:@"iPad5,2"])      return @"iPad mini 4 (Cellular)";
        if ([platform isEqualToString:@"iPad11,1"])     return @"iPad mini (5th generation) (2019) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad11,2"])     return @"iPad mini (5th generation) (2019) (Cellular)";
        
        //Apple TV
        if ([platform isEqualToString:@"AppleTV2,1"])   return @"Apple TV 2G";
        if ([platform isEqualToString:@"AppleTV3,1"])   return @"Apple TV 3";
        if ([platform isEqualToString:@"AppleTV3,2"])   return @"Apple TV 3 (2013)";
        if ([platform isEqualToString:@"AppleTV5,3"])   return @"Apple TV 4";
        if ([platform isEqualToString:@"AppleTV6,2"])   return @"Apple TV 4K";
        
        //Apple Watch
        if ([platform isEqualToString:@"Watch1,1"])     return @"Apple Watch (1st generation) (38mm)";
        if ([platform isEqualToString:@"Watch1,2"])     return @"Apple Watch (1st generation) (42mm)";
        if ([platform isEqualToString:@"Watch2,6"])     return @"Apple Watch Series 1 (38mm)";
        if ([platform isEqualToString:@"Watch2,7"])     return @"Apple Watch Series 1 (42mm)";
        if ([platform isEqualToString:@"Watch2,3"])     return @"Apple Watch Series 2 (38mm)";
        if ([platform isEqualToString:@"Watch2,4"])     return @"Apple Watch Series 2 (42mm)";
        if ([platform isEqualToString:@"Watch3,1"])     return @"Apple Watch Series 3 (38mm Cellular)";
        if ([platform isEqualToString:@"Watch3,2"])     return @"Apple Watch Series 3 (42mm Cellular)";
        if ([platform isEqualToString:@"Watch3,3"])     return @"Apple Watch Series 3 (38mm)";
        if ([platform isEqualToString:@"Watch3,4"])     return @"Apple Watch Series 3 (42mm)";
        if ([platform isEqualToString:@"Watch4,1"])     return @"Apple Watch Series 4 (40mm)";
        if ([platform isEqualToString:@"Watch4,2"])     return @"Apple Watch Series 4 (44mm)";
        if ([platform isEqualToString:@"Watch4,3"])     return @"Apple Watch Series 4 (40mm Cellular)";
        if ([platform isEqualToString:@"Watch4,4"])     return @"Apple Watch Series 4 (44mm Cellular)";
        if ([platform isEqualToString:@"Watch5,1"])     return @"Apple Watch Series 5 (40mm)";
        if ([platform isEqualToString:@"Watch5,2"])     return @"Apple Watch Series 5 (44mm)";
        if ([platform isEqualToString:@"Watch5,3"])     return @"Apple Watch Series 5 (40mm Cellular)";
        if ([platform isEqualToString:@"Watch5,4"])     return @"Apple Watch Series 5 (44mm Cellular)";
        if ([platform isEqualToString:@"Watch6,1"])     return @"Apple Watch Series 6 (40mm)";
        if ([platform isEqualToString:@"Watch6,2"])     return @"Apple Watch Series 6 (44mm)";
        if ([platform isEqualToString:@"Watch6,3"])     return @"Apple Watch Series 6 (40mm Cellular)";
        if ([platform isEqualToString:@"Watch6,4"])     return @"Apple Watch Series 6 (44mm Cellular)";
        if ([platform isEqualToString:@"Watch5,9"])     return @"Apple Watch SE (40mm)";
        if ([platform isEqualToString:@"Watch5,10"])    return @"Apple Watch SE (44mm)";
        if ([platform isEqualToString:@"Watch5,11"])    return @"Apple Watch SE (40mm Cellular)";
        if ([platform isEqualToString:@"Watch5,12"])    return @"Apple Watch SE (44mm Cellular)";
        
        //Simulator
        if ([platform isEqualToString:@"i386"])         return @"Simulator";
        if ([platform isEqualToString:@"x86_64"])       return @"Simulator";
    
    return platform;
}

You can test it using following code:

NSLog(@"Current device is: %@", [self userDeviceName]);

- (BOOL)deviceiPhoneOriPod
  {
    NSString *deviceType = [UIDevice currentDevice].model;
    if([deviceType rangeOfString:@"iPhone"].location!=NSNotFound)
      return YES;
    else
      return NO;
  }

Based on the very good answers above, here is what I came up with. This is very similar to @Rodrigo's answer, but addresses @Oliver's concern from the comment on that answer. This also provides the option of including the model string in the output string.

+ (NSString *) deviceModel {
    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);
    char *model = malloc(size);
    sysctlbyname("hw.machine", model, &size, NULL, 0);
    NSString *deviceModel = [NSString stringWithCString:model encoding:NSUTF8StringEncoding];
    free(model);      

    return deviceModel;
}

+ (NSString *) deviceName {
    NSString *deviceModel = [DeviceGateway deviceModel];                    

    if ([deviceModel isEqual:@"i386"])      return @"Simulator";  //iPhone Simulator
    if ([deviceModel isEqual:@"iPhone1,1"]) return @"iPhone1G";   //iPhone 1G
    if ([deviceModel isEqual:@"iPhone1,2"]) return @"iPhone3G";   //iPhone 3G
    if ([deviceModel isEqual:@"iPhone2,1"]) return @"iPhone3GS";  //iPhone 3GS
    if ([deviceModel isEqual:@"iPhone3,1"]) return @"iPhone4";    //iPhone 4 - AT&T
    if ([deviceModel isEqual:@"iPhone3,2"]) return @"iPhone4";    //iPhone 4 - Other carrier
    if ([deviceModel isEqual:@"iPhone3,3"]) return @"iPhone4";    //iPhone 4 - Other carrier
    if ([deviceModel isEqual:@"iPhone4,1"]) return @"iPhone4S";   //iPhone 4S
    if ([deviceModel isEqual:@"iPod1,1"])   return @"iPod1stGen"; //iPod Touch 1G
    if ([deviceModel isEqual:@"iPod2,1"])   return @"iPod2ndGen"; //iPod Touch 2G
    if ([deviceModel isEqual:@"iPod3,1"])   return @"iPod3rdGen"; //iPod Touch 3G
    if ([deviceModel isEqual:@"iPod4,1"])   return @"iPod4thGen"; //iPod Touch 4G
    if ([deviceModel isEqual:@"iPad1,1"])   return @"iPadWiFi";   //iPad Wifi
    if ([deviceModel isEqual:@"iPad1,2"])   return @"iPad3G";     //iPad 3G
    if ([deviceModel isEqual:@"iPad2,1"])   return @"iPad2";      //iPad 2 (WiFi)
    if ([deviceModel isEqual:@"iPad2,2"])   return @"iPad2";      //iPad 2 (GSM)
    if ([deviceModel isEqual:@"iPad2,3"])   return @"iPad2";      //iPad 2 (CDMA)

    NSString *aux = [[deviceModel componentsSeparatedByString:@","] objectAtIndex:0];

    //If a newer version exists
    if ([aux rangeOfString:@"iPhone"].location != NSNotFound) {
        int version = [[aux stringByReplacingOccurrencesOfString:@"iPhone" withString:@""] intValue];
        if (version == 3) return @"iPhone4";
        if (version == 4) return @"iPhone4s";
        return @"Newer iPhone";
    }
    if ([aux rangeOfString:@"iPod"].location != NSNotFound) {
        int version = [[aux stringByReplacingOccurrencesOfString:@"iPod" withString:@""] intValue];
        if (version == 4) return @"iPod4thGen";
        return @"Newer iPod";
    }
    if ([aux rangeOfString:@"iPad"].location != NSNotFound) {
        int version = [[aux stringByReplacingOccurrencesOfString:@"iPad" withString:@""] intValue];
        if (version == 1) return @"iPad3G";
        if (version == 2) return @"iPad2";
        return @"Newer iPad";
    }

    //If none was found, send the original string
    return deviceModel;
}

+ (NSString *) deviceNameWithDeviceModel:(BOOL)shouldIncludeDeviceModel {
    if (shouldIncludeDeviceModel) {
        return [NSString stringWithFormat:@"%@ (%@)", [DeviceGateway deviceName], [DeviceGateway deviceModel]];
    }

    return [DeviceGateway deviceName];
}

This is an update for UIDeviceHardware.m from the answer above.

- (NSString *)platformString
{
    NSString *platform = [self platform];

    if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 1G";
    if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,3"])    return @"Verizon iPhone 4";
    if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
    if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5 (GSM)";
    if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
    if ([platform isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
    if ([platform isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone7,1"])    return @"iPhone 6";
    if ([platform isEqualToString:@"iPhone7,2"])    return @"iPhone 6 Plus";
    if ([platform isEqualToString:@"iPhone8,1"])    return @"iPhone 6s";
    if ([platform isEqualToString:@"iPhone8,2"])    return @"iPhone 6s Plus";
    if ([platform isEqualToString:@"iPhone8,4"])    return @"iPhone SE";
    if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
    if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
    if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
    if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
    if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch 5G";
    if ([platform isEqualToString:@"iPod7,1"])      return @"iPod Touch 6G";
    if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
    if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
    if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
    if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini (GSM)";
    if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
    if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3 (GSM)";
    if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
    if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4 (GSM)";
    if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";
    if ([platform isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
    if ([platform isEqualToString:@"iPad4,4"])      return @"iPad mini 2G (WiFi)";
    if ([platform isEqualToString:@"iPad4,5"])      return @"iPad mini 2G (Cellular)";
    if ([platform isEqualToString:@"iPad5,1"])      return @"iPad mini 4 (WiFi)";
    if ([platform isEqualToString:@"iPad5,2"])      return @"iPad mini 4 (Cellular)";
    if ([platform isEqualToString:@"iPad5,3"])      return @"iPad Air 2 (WiFi)";
    if ([platform isEqualToString:@"iPad5,4"])      return @"iPad Air 2 (Cellular)";
    if ([platform isEqualToString:@"iPad6,3"])      return @"iPad Pro 9.7 inch (WiFi)";
    if ([platform isEqualToString:@"iPad6,4"])      return @"iPad Pro 9.7 inch (Cellular)";
    if ([platform isEqualToString:@"iPad6,7"])      return @"iPad Pro 12.9 inch (WiFi)";
    if ([platform isEqualToString:@"iPad6,8"])      return @"iPad Pro 12.9 inch (Cellular)";
    if ([platform isEqualToString:@"i386"])         return @"Simulator";
    if ([platform isEqualToString:@"x86_64"])       return @"Simulator";

    return platform;
}

Adding to Arash's code, I don't care for my app what model I'm using, I just want to know what kind of device, so, I can test as follows:

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
        {
            NSLog(@"I'm definitely an iPad");
    } else {
    NSString *deviceType = [UIDevice currentDevice].model;
                if([deviceType rangeOfString:@"iPhone"].location!=NSNotFound)
                {
                    NSLog(@"I must be an iPhone");

                } else {
                    NSLog(@"I think I'm an iPod");

                }
}

if([UIDevice currentDevice].userInterfaceIdiom==UIUserInterfaceIdiomPad) {
    //Device is ipad 
}else{
    //Device is iphone
}

I use this in my app. Up to date as of December 2012.

- (NSString *) platformString {
    // Gets a string with the device model
    size_t size;  
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);  
    char *machine = malloc(size);  
    sysctlbyname("hw.machine", machine, &size, NULL, 0);  
    NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];  
    free(machine); 

    if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 2G";
    if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,2"])    return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,3"])    return @"iPhone 4 (CDMA)";    
    if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
    if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5";
    if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";

    if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch (1 Gen)";
    if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch (2 Gen)";
    if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch (3 Gen)";
    if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch (4 Gen)";
    if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch (5 Gen)";

    if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([platform isEqualToString:@"iPad1,2"])      return @"iPad 3G";
    if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2";
    if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
    if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2";
    if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
    if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini";
    if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
    if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3";
    if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
    if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4";
    if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";

    if ([platform isEqualToString:@"i386"])         return @"Simulator";
    if ([platform isEqualToString:@"x86_64"])       return @"Simulator";

    return platform;
}  

NSString *deviceType = [[UIDevice currentDevice] systemName];

I can assure that the above suggested one will work in iOS 7 and above. I believe it will work in iOS 6 too. But am not sure about that.

Adding to Arash's code, I don't care for my app what model I'm using, I just want to know what kind of device, so, I can test as follows:

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
        {
            NSLog(@"I'm definitely an iPad");
    } else {
    NSString *deviceType = [UIDevice currentDevice].model;
                if([deviceType rangeOfString:@"iPhone"].location!=NSNotFound)
                {
                    NSLog(@"I must be an iPhone");

                } else {
                    NSLog(@"I think I'm an iPod");

                }
}

Answer in Swift 3,

struct DeviceInformation {
    // UIDevice.current.model's value is "iPhone" or "iPad",which does not include details; the following "model" is detailed, such as, iPhone7,1 is actually iPhone 6 plus
    static let model: String = {
        var size = 0
        sysctlbyname("hw.machine", nil, &size, nil, 0)
        var machine = [CChar](repeating: 0,  count: Int(size))
        sysctlbyname("hw.machine", &machine, &size, nil, 0)
        return String(cString: machine)
    }()

    static let uuid = UIDevice.current.identifierForVendor?.uuidString ?? ""
    static let idForAdService = ASIdentifierManager.shared().advertisingIdentifier.uuidString

    static func diviceTypeReadableName() -> String {
        switch model {
        case "iPhone1,1":   return "iPhone 1G"
        case "iPhone1,2":   return "iPhone 3G"
        case "iPhone2,1":   return "iPhone 3GS"
        case "iPhone3,1":   return "iPhone 4"
        case "iPhone3,3":   return "iPhone 4 (Verizon)"
        case "iPhone4,1":   return "iPhone 4S"
        case "iPhone5,1":   return "iPhone 5 (GSM)"
        case "iPhone5,2":   return "iPhone 5 (GSM+CDMA)"
        case "iPhone5,3":   return "iPhone 5c (GSM)"
        case "iPhone5,4":   return "iPhone 5c (GSM+CDMA)"
        case "iPhone6,1":   return "iPhone 5s (GSM)"
        case "iPhone6,2":   return "iPhone 5s (GSM+CDMA)"
        case "iPhone7,2":   return "iPhone 6"
        case "iPhone7,1":   return "iPhone 6 Plus"
        case "iPhone8,1":   return "iPhone 6s"
        case "iPhone8,2":   return "iPhone 6s Plus"
        case "iPhone8,4":   return "iPhone SE"
        case "iPhone9,1":   return "iPhone 7"
        case "iPhone9,3":   return "iPhone 7"
        case "iPhone9,2":   return "iPhone 7 Plus"
        case "iPhone9,4":   return "iPhone 7 Plus"
        case "iPod1,1":     return "iPod Touch 1G"
        case "iPod2,1":     return "iPod Touch 2G"
        case "iPod3,1":     return "iPod Touch 3G"
        case "iPod4,1":     return "iPod Touch 4G"
        case "iPod5,1":     return "iPod Touch 5G"
        case "iPod7,1":     return "iPod Touch 6G"
        case "iPad1,1":     return "iPad 1G"
        case "iPad2,1":     return "iPad 2 (Wi-Fi)"
        case "iPad2,2":     return "iPad 2 (GSM)"
        case "iPad2,3":     return "iPad 2 (CDMA)"
        case "iPad2,4":     return "iPad 2 (Wi-Fi)"
        case "iPad2,5":     return "iPad Mini (Wi-Fi)"
        case "iPad2,6":     return "iPad Mini (GSM)"
        case "iPad2,7":     return "iPad Mini (GSM+CDMA)"
        case "iPad3,1":     return "iPad 3 (Wi-Fi)"
        case "iPad3,2":     return "iPad 3 (GSM+CDMA)"
        case "iPad3,3":     return "iPad 3 (GSM)"
        case "iPad3,4":     return "iPad 4 (Wi-Fi)"
        case "iPad3,5":     return "iPad 4 (GSM)"
        case "iPad3,6":     return "iPad 4 (GSM+CDMA)"
        case "iPad4,1":     return "iPad Air (Wi-Fi)"
        case "iPad4,2":     return "iPad Air (Cellular)"
        case "iPad4,3":     return "iPad Air (China)"
        case "iPad4,4":     return "iPad Mini 2G (Wi-Fi)"
        case "iPad4,5":     return "iPad Mini 2G (Cellular)"
        case "iPad4,6":     return "iPad Mini 2G (China)"
        case "iPad4,7":     return "iPad Mini 3 (Wi-Fi)"
        case "iPad4,8":     return "iPad Mini 3 (Cellular)"
        case "iPad4,9":     return "iPad Mini 3 (China)"
        case "iPad5,1":     return "iPad Mini 4 (Wi-Fi)"
        case "iPad5,2":     return "iPad Mini 4 (Cellular)"
        case "iPad5,3":     return "iPad Air 2 (Wi-Fi)"
        case "iPad5,4":     return "iPad Air 2 (Cellular)"
        case "iPad6,3":     return "iPad Pro 9.7' (Wi-Fi)"
        case "iPad6,4":     return "iPad Pro 9.7' (Cellular)"
        case "iPad6,7":     return "iPad Pro 12.9' (Wi-Fi)"
        case "iPad6,8":     return "iPad Pro 12.9' (Cellular)"
        case "AppleTV2,1":  return "Apple TV 2G"
        case "AppleTV3,1":  return "Apple TV 3"
        case "AppleTV3,2":  return "Apple TV 3 (2013)"
        case "AppleTV5,3":  return "Apple TV 4"
        case "Watch1,1":    return "Apple Watch Series 1 (38mm, S1)"
        case "Watch1,2":    return "Apple Watch Series 1 (42mm, S1)"
        case "Watch2,6":    return "Apple Watch Series 1 (38mm, S1P)"
        case "Watch2,7":    return "Apple Watch Series 1 (42mm, S1P)"
        case "Watch2,3":    return "Apple Watch Series 2 (38mm, S2)"
        case "Watch2,4":    return "Apple Watch Series 2 (42mm, S2)"
        case "i386":        return "Simulator"
        case "x86_64":      return "Simulator"

        default:
            return ""
        }
    }
}

Here's a minor update with new models:

- (NSString *) platformString{
    NSString *platform = [self platform];
    if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 1G";
    if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
    if ([platform isEqualToString:@"iPod1,1"])   return @"iPod Touch 1G";
    if ([platform isEqualToString:@"iPod2,1"])   return @"iPod Touch 2G";
    if ([platform isEqualToString:@"iPod3,1"])   return @"iPod Touch 3G";
    if ([platform isEqualToString:@"i386"])   return @"iPhone Simulator";
    return platform;
}

To identifiy iPhone 4S, simply check the following:

var isIphone4S: Bool {

    let width = UIScreen.main.bounds.size.width
    let height = UIScreen.main.bounds.size.height
    let proportions = width > height ? width / height : height / width

    return proportions == 1.5 && UIDevice.current.model == "iPhone"
}

I've created an extension that lets you to have 3 levels of identification:

  1. type of device
  2. type of iPhone/iPad by inch
  3. model of device

It updates with last iOS devices

UIDeviceDetector

I'd like to add that to retrieve the front and enclosure color of the device there's a private API:

UIDevice *device = [UIDevice currentDevice];
SEL selector = NSSelectorFromString([device.systemVersion hasPrefix:@"7"] ? @"_deviceInfoForKey:" :  @"deviceInfoForKey:");
if ([device respondsToSelector:selector]) {
    NSLog(@"DeviceColor: %@ DeviceEnclosureColor: %@", [device performSelector:selector withObject:@"DeviceColor"], [device performSelector:selector withObject:@"DeviceEnclosureColor"]);
}

I've blogged about this and provide a sample app:

http://www.futuretap.com/blog/device-colors/

There's a pretty mature library (by me) for that called SDVersion. You can check for running device's model, screen size and many other parameters. It also supports OSX.

Example: 

      // Check for device model
      if ([SDVersion deviceVersion] == iPhone6)
           NSLog(@"You got the iPhone 6. Sweet !");
      else if ([SDVersion deviceVersion] == iPhone6Plus)
           NSLog(@"iPhone 6 Plus? Bigger is better!");
      else if ([SDVersion deviceVersion] == iPadAir2)
           NSLog(@"You own an iPad Air 2 !");

      // Check for device screen size
      if ([SDVersion deviceSize] == Screen4inch)
           NSLog(@"Your screen is 4 inches");

I like Erica Sadun's stuff. She includes AppleTV devices and others you might not think of.

https://github.com/erica/uidevice-extension/blob/master/UIDevice-Hardware.h

I use this in my app. Up to date as of December 2012.

- (NSString *) platformString {
    // Gets a string with the device model
    size_t size;  
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);  
    char *machine = malloc(size);  
    sysctlbyname("hw.machine", machine, &size, NULL, 0);  
    NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];  
    free(machine); 

    if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 2G";
    if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,2"])    return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,3"])    return @"iPhone 4 (CDMA)";    
    if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
    if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5";
    if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";

    if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch (1 Gen)";
    if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch (2 Gen)";
    if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch (3 Gen)";
    if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch (4 Gen)";
    if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch (5 Gen)";

    if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([platform isEqualToString:@"iPad1,2"])      return @"iPad 3G";
    if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2";
    if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
    if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2";
    if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
    if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini";
    if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
    if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3";
    if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
    if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4";
    if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";

    if ([platform isEqualToString:@"i386"])         return @"Simulator";
    if ([platform isEqualToString:@"x86_64"])       return @"Simulator";

    return platform;
}

Update platform string.

// Created from this thread: https://gist.github.com/Jaybles/1323251

// Apple TV
if ([platform isEqualToString:@"AppleTV2,1"])   return @"Apple TV 2G";
if ([platform isEqualToString:@"AppleTV3,1"])   return @"Apple TV 3G";
if ([platform isEqualToString:@"AppleTV3,2"])   return @"Apple TV 3G";
if ([platform isEqualToString:@"AppleTV5,3"])   return @"Apple TV 4G";

// Apple Watch
if ([platform isEqualToString:@"Watch1,1"])     return @"Apple Watch";
if ([platform isEqualToString:@"Watch1,2"])     return @"Apple Watch";

// iPhone
if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 2G";
if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4 (GSM)";
if ([platform isEqualToString:@"iPhone3,2"])    return @"iPhone 4 (GSM/2012)";
if ([platform isEqualToString:@"iPhone3,3"])    return @"iPhone 4 (CDMA)";
if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5 (GSM)";
if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (Global)";
if ([platform isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
if ([platform isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (Global)";
if ([platform isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
if ([platform isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (Global)";
if ([platform isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
if ([platform isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
if ([platform isEqualToString:@"iPhone8,1"])    return @"iPhone 6s";
if ([platform isEqualToString:@"iPhone8,2"])    return @"iPhone 6s Plus";
if ([platform isEqualToString:@"iPhone8,4"])    return @"iPhone SE";
if ([platform isEqualToString:@"iPhone9,1"])    return @"iPhone 7 (Global)";
if ([platform isEqualToString:@"iPhone9,3"])    return @"iPhone 7 (GSM)";
if ([platform isEqualToString:@"iPhone9,2"])    return @"iPhone 7 Plus (Global)";
if ([platform isEqualToString:@"iPhone9,4"])    return @"iPhone 7 Plus (GSM)";

// iPad
if ([platform isEqualToString:@"iPad1,1"])      return @"iPad 1";
if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2 (Mid 2012)";
if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (CDMA)";
if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3 (GSM)";
if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4 (GSM)";
if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (Global)";

// iPad Air
if ([platform isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";
if ([platform isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
if ([platform isEqualToString:@"iPad4,3"])      return @"iPad Air (China)";
if ([platform isEqualToString:@"iPad5,3"])      return @"iPad Air 2 (WiFi)";
if ([platform isEqualToString:@"iPad5,4"])      return @"iPad Air 2 (Cellular)";

// iPad Mini
if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini (GSM)";
if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (Global)";
if ([platform isEqualToString:@"iPad4,4"])      return @"iPad Mini 2 (WiFi)";
if ([platform isEqualToString:@"iPad4,5"])      return @"iPad Mini 2 (Cellular)";
if ([platform isEqualToString:@"iPad4,6"])      return @"iPad Mini 2 (China)";
if ([platform isEqualToString:@"iPad4,7"])      return @"iPad Mini 3 (WiFi)";
if ([platform isEqualToString:@"iPad4,8"])      return @"iPad Mini 3 (Cellular)";
if ([platform isEqualToString:@"iPad4,9"])      return @"iPad Mini 3 (China)";
if ([platform isEqualToString:@"iPad5,1"])      return @"iPad Mini 4 (WiFi)";
if ([platform isEqualToString:@"iPad5,2"])      return @"iPad Mini 4 (Cellular)";

// iPad Pro
if ([platform isEqualToString:@"iPad6,3"])      return @"iPad Pro (9.7 inch/WiFi)";
if ([platform isEqualToString:@"iPad6,4"])      return @"iPad Pro (9.7 inch/Cellular)";
if ([platform isEqualToString:@"iPad6,7"])      return @"iPad Pro (12.9 inch/WiFi)";
if ([platform isEqualToString:@"iPad6,8"])      return @"iPad Pro (12.9 inch/Cellular)";

// iPod
if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch 5G";
if ([platform isEqualToString:@"iPod7,1"])      return @"iPod Touch 6G";

// Simulator
if ([platform isEqualToString:@"i386"])         return @"Simulator";
if ([platform isEqualToString:@"x86_64"])       return @"Simulator";

Dutchie432 and Brian Robbins have provided great solutions. But there's still one model missing, the Verizon iPhone 4. Here's the missing line.

if ([platform isEqualToString:@"iPhone3,2"])    return @"iPhone 4"; //Verizon

Just adding the iPhone 4S device code to this thread...

The iPhone 4S will return the string @"iPhone4,1".

Latest update - November 2020: Added iPhone 12, iPhone 12 mini iPhone 12 Pro, iPhone 12 Pro Max, iPhone SE (2nd generation), iPad (8th generation), iPad Air (4th generation), Apple Watch 6, Apple Watch SE

Previous update - June 2020: Added iPad Pro 11 2020 (2nd generation), iPad Pro 12.9 2020 (4th generation), Apple Watch 5

Swift

(Tested on Swift 5, Swift 4, Swift 3)

The function below returns a string with current device name.

func userDeviceName() -> String {
    let platform: String = {
        var size = 0
        sysctlbyname("hw.machine", nil, &size, nil, 0)
        var machine = [CChar](repeating: 0,  count: Int(size))
        sysctlbyname("hw.machine", &machine, &size, nil, 0)
        return String(cString: machine)
    }()
    
    //iPhone
    if platform == "iPhone1,1"        { return "iPhone (1st generation)" }
    else if platform == "iPhone1,2"   { return "iPhone 3G" }
    else if platform == "iPhone2,1"   { return "iPhone 3GS" }
    else if platform == "iPhone3,1"   { return "iPhone 4 (GSM)" }
    else if platform == "iPhone3,2"   { return "iPhone 4 (GSM, 2nd revision)" }
    else if platform == "iPhone3,3"   { return "iPhone 4 (CDMA)" }
    else if platform == "iPhone4,1"   { return "iPhone 4S" }
    else if platform == "iPhone5,1"   { return "iPhone 5 (GSM)" }
    else if platform == "iPhone5,2"   { return "iPhone 5 (GSM+CDMA)" }
    else if platform == "iPhone5,3"   { return "iPhone 5c (GSM)" }
    else if platform == "iPhone5,4"   { return "iPhone 5c (GSM+CDMA)" }
    else if platform == "iPhone6,1"   { return "iPhone 5s (GSM)" }
    else if platform == "iPhone6,2"   { return "iPhone 5s (GSM+CDMA)" }
    else if platform == "iPhone7,2"   { return "iPhone 6" }
    else if platform == "iPhone7,1"   { return "iPhone 6 Plus" }
    else if platform == "iPhone8,1"   { return "iPhone 6s" }
    else if platform == "iPhone8,2"   { return "iPhone 6s Plus" }
    else if platform == "iPhone8,4"   { return "iPhone SE" }
    else if platform == "iPhone9,1"   { return "iPhone 7 (GSM+CDMA)" }
    else if platform == "iPhone9,3"   { return "iPhone 7 (GSM)" }
    else if platform == "iPhone9,2"   { return "iPhone 7 Plus (GSM+CDMA)" }
    else if platform == "iPhone9,4"   { return "iPhone 7 Plus (GSM)" }
    else if platform == "iPhone10,1"  { return "iPhone 8 (GSM+CDMA)" }
    else if platform == "iPhone10,4"  { return "iPhone 8 (GSM)" }
    else if platform == "iPhone10,2"  { return "iPhone 8 Plus (GSM+CDMA)" }
    else if platform == "iPhone10,5"  { return "iPhone 8 Plus (GSM)" }
    else if platform == "iPhone10,3"  { return "iPhone X (GSM+CDMA)" }
    else if platform == "iPhone10,6"  { return "iPhone X (GSM)" }
    else if platform == "iPhone11,2"  { return "iPhone XS" }
    else if platform == "iPhone11,6"  { return "iPhone XS Max" }
    else if platform == "iPhone11,8"  { return "iPhone XR" }
    else if platform == "iPhone12,1"  { return "iPhone 11" }
    else if platform == "iPhone12,3"  { return "iPhone 11 Pro" }
    else if platform == "iPhone12,5"  { return "iPhone 11 Pro Max" }
    else if platform == "iPhone12,8"  { return "iPhone SE (2nd generation)" }
    else if platform == "iPhone13,1"  { return "iPhone 12 mini" }
    else if platform == "iPhone13,2"  { return "iPhone 12" }
    else if platform == "iPhone13,3"  { return "iPhone 12 Pro" }
    else if platform == "iPhone13,4"  { return "iPhone 12 Pro Max" }
        
        //iPod Touch
    else if platform == "iPod1,1"     { return "iPod Touch (1st generation)" }
    else if platform == "iPod2,1"     { return "iPod Touch (2nd generation)" }
    else if platform == "iPod3,1"     { return "iPod Touch (3rd generation)" }
    else if platform == "iPod4,1"     { return "iPod Touch (4th generation)" }
    else if platform == "iPod5,1"     { return "iPod Touch (5th generation)" }
    else if platform == "iPod7,1"     { return "iPod Touch (6th generation)" }
    else if platform == "iPod9,1"     { return "iPod Touch (7th generation) (2019)" }
        
        //iPad
    else if platform == "iPad1,1"     { return "iPad (1st generation)" }
    else if platform == "iPad2,1"     { return "iPad 2 (Wi-Fi)" }
    else if platform == "iPad2,2"     { return "iPad 2 (GSM)" }
    else if platform == "iPad2,3"     { return "iPad 2 (CDMA)" }
    else if platform == "iPad2,4"     { return "iPad 2 (Wi-Fi, Mid 2012)" }
    else if platform == "iPad3,1"     { return "iPad (3rd generation) (Wi-Fi)" }
    else if platform == "iPad3,2"     { return "iPad (3rd generation) (GSM+CDMA)" }
    else if platform == "iPad3,3"     { return "iPad (3rd generation) (GSM)" }
    else if platform == "iPad3,4"     { return "iPad (4th generation) (Wi-Fi)"}
    else if platform == "iPad3,5"     { return "iPad (4th generation) (GSM)" }
    else if platform == "iPad3,6"     { return "iPad (4th generation) (GSM+CDMA)" }
    else if platform == "iPad6,11"    { return "iPad (5th generation) (Wi-Fi)" }
    else if platform == "iPad6,12"    { return "iPad (5th generation) (Cellular)" }
    else if platform == "iPad7,5"     { return "iPad (6th generation) (2018) (Wi-Fi)" }
    else if platform == "iPad7,6"     { return "iPad (6th generation) (2018) (Cellular)" }
    else if platform == "iPad7,11"    { return "iPad (7th generation) (2019) (Wi-Fi)" }
    else if platform == "iPad7,12"    { return "iPad (7th generation) (2019) (Cellular)" }
    else if platform == "iPad11,6"    { return "iPad (8th generation) (2020) (Wi-Fi)" }
    else if platform == "iPad11,7"    { return "iPad (8th generation) (2020) (Cellular)" }
        
        //iPad Air
    else if platform == "iPad4,1"     { return "iPad Air (Wi-Fi)" }
    else if platform == "iPad4,2"     { return "iPad Air (Cellular)" }
    else if platform == "iPad4,3"     { return "iPad Air (China)" }
    else if platform == "iPad5,3"     { return "iPad Air 2 (Wi-Fi)" }
    else if platform == "iPad5,4"     { return "iPad Air 2 (Cellular)" }
    else if platform == "iPad11,3"    { return "iPad Air (3rd generation) (2019) (Wi-Fi)" }
    else if platform == "iPad11,4"    { return "iPad Air (3rd generation) (2019) (Cellular)" }
    else if platform == "iPad13,1"    { return "iPad Air (4th generation) (2020) (Wi-Fi)" }
    else if platform == "iPad13,2"    { return "iPad Air (4th generation) (2020) (Cellular)" }
        
        //iPad Pro
    else if platform == "iPad6,3"     { return "iPad Pro 9.7\" (Wi-Fi)" }
    else if platform == "iPad6,4"     { return "iPad Pro 9.7\" (Cellular)" }
    else if platform == "iPad6,7"     { return "iPad Pro 12.9\" (Wi-Fi)" }
    else if platform == "iPad6,8"     { return "iPad Pro 12.9\" (Cellular)" }
    else if platform == "iPad7,1"     { return "iPad Pro 12.9\" (2nd generation) (Wi-Fi)" }
    else if platform == "iPad7,2"     { return "iPad Pro 12.9\" (2nd generation) (Cellular)" }
    else if platform == "iPad7,3"     { return "iPad Pro 10.5\" (Wi-Fi)" }
    else if platform == "iPad7,4"     { return "iPad Pro 10.5\" (Cellular)" }
    else if platform == "iPad8,1"     { return "iPad Pro 11\" (2018) (Wi-Fi)" }
    else if platform == "iPad8,2"     { return "iPad Pro 11\" (2018) (Wi-Fi, 1TB)" }
    else if platform == "iPad8,3"     { return "iPad Pro 11\" (2018) (Cellular)" }
    else if platform == "iPad8,4"     { return "iPad Pro 11\" (2018) (Cellular 1TB)" }
    else if platform == "iPad8,5"     { return "iPad Pro 12.9\" (3rd generation) (2018) (Wi-Fi)" }
    else if platform == "iPad8,6"     { return "iPad Pro 12.9\" (3rd generation) (2018) (Cellular)" }
    else if platform == "iPad8,7"     { return "iPad Pro 12.9\" (3rd generation) (2018) (Wi-Fi, 1TB)" }
    else if platform == "iPad8,8"     { return "iPad Pro 12.9\" (3rd generation) (2018) (Cellular, 1TB)" }
    else if platform == "iPad8,9"     { return "iPad Pro 11\" (2nd generation) (2020) (Wi-Fi)" }
    else if platform == "iPad8,10"    { return "iPad Pro 11\" (2nd generation) (2020) (Cellular)" }
    else if platform == "iPad8,11"    { return "iPad Pro 12.9\" (4th generation) (2020) (Wi-Fi)" }
    else if platform == "iPad8,12"    { return "iPad Pro 12.9\" (4th generation) (2020) (Cellular)" }
        
        //iPad Mini
    else if platform == "iPad2,5"     { return "iPad mini (Wi-Fi)" }
    else if platform == "iPad2,6"     { return "iPad mini (GSM)" }
    else if platform == "iPad2,7"     { return "iPad mini (GSM+CDMA)" }
    else if platform == "iPad4,4"     { return "iPad mini 2 (Wi-Fi)" }
    else if platform == "iPad4,5"     { return "iPad mini 2 (Cellular)" }
    else if platform == "iPad4,6"     { return "iPad mini 2 (China)" }
    else if platform == "iPad4,7"     { return "iPad mini 3 (Wi-Fi)" }
    else if platform == "iPad4,8"     { return "iPad mini 3 (Cellular)" }
    else if platform == "iPad4,9"     { return "iPad mini 3 (China)" }
    else if platform == "iPad5,1"     { return "iPad mini 4 (Wi-Fi)" }
    else if platform == "iPad5,2"     { return "iPad mini 4 (Cellular)" }
    else if platform == "iPad11,1"    { return "iPad mini (5th generation) (2019) (Wi-Fi)" }
    else if platform == "iPad11,2"    { return "iPad mini (5th generation) (2019) (Cellular)" }
        
        //Apple TV
    else if platform == "AppleTV2,1"  { return "Apple TV 2G" }
    else if platform == "AppleTV3,1"  { return "Apple TV 3" }
    else if platform == "AppleTV3,2"  { return "Apple TV 3 (2013)" }
    else if platform == "AppleTV5,3"  { return "Apple TV 4" }
    else if platform == "AppleTV6,2"  { return "Apple TV 4K" }
        
        //Apple Watch
    else if platform == "Watch1,1"    { return "Apple Watch (1st generation) (38mm)" }
    else if platform == "Watch1,2"    { return "Apple Watch (1st generation) (42mm)" }
    else if platform == "Watch2,6"    { return "Apple Watch Series 1 (38mm)" }
    else if platform == "Watch2,7"    { return "Apple Watch Series 1 (42mm)" }
    else if platform == "Watch2,3"    { return "Apple Watch Series 2 (38mm)" }
    else if platform == "Watch2,4"    { return "Apple Watch Series 2 (42mm)" }
    else if platform == "Watch3,1"    { return "Apple Watch Series 3 (38mm Cellular)" }
    else if platform == "Watch3,2"    { return "Apple Watch Series 3 (42mm Cellular)" }
    else if platform == "Watch3,3"    { return "Apple Watch Series 3 (38mm)" }
    else if platform == "Watch3,4"    { return "Apple Watch Series 3 (42mm)" }
    else if platform == "Watch4,1"    { return "Apple Watch Series 4 (40mm)" }
    else if platform == "Watch4,2"    { return "Apple Watch Series 4 (44mm)" }
    else if platform == "Watch4,3"    { return "Apple Watch Series 4 (40mm Cellular)" }
    else if platform == "Watch4,4"    { return "Apple Watch Series 4 (44mm Cellular)" }
    else if platform == "Watch5,1"    { return "Apple Watch Series 5 (40mm)" }
    else if platform == "Watch5,2"    { return "Apple Watch Series 5 (44mm)" }
    else if platform == "Watch5,3"    { return "Apple Watch Series 5 (40mm Cellular)" }
    else if platform == "Watch5,4"    { return "Apple Watch Series 5 (44mm Cellular)" }
    else if platform == "Watch6,1"    { return "Apple Watch Series 6 (40mm)" }
    else if platform == "Watch6,2"    { return "Apple Watch Series 6 (44mm)" }
    else if platform == "Watch6,3"    { return "Apple Watch Series 6 (40mm Cellular)" }
    else if platform == "Watch6,4"    { return "Apple Watch Series 6 (44mm Cellular)" }
    else if platform == "Watch5,9"    { return "Apple Watch SE (40mm)" }
    else if platform == "Watch5,10"   { return "Apple Watch SE (44mm)" }
    else if platform == "Watch5,11"   { return "Apple Watch SE (40mm Cellular)" }
    else if platform == "Watch5,12"   { return "Apple Watch SE (44mm Cellular)" }
        
        //Simulator
    else if platform == "i386"        { return "Simulator" }
    else if platform == "x86_64"      { return "Simulator"}
    
    return platform
}

You can test it using following code:

print("Current device is: ", self.userDeviceName())

Objective-C

I also added new devices to the Objective-C code

Don't forget to import sys/sysctl.h

     #import <sys/sysctl.h>  
           
            
- (NSString *) userDeviceName {
    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);
    char *machine = malloc(size);
    sysctlbyname("hw.machine", machine, &size, NULL, 0);
    NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];
    
    free(machine);
    
        //iPhone
        if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone (1st generation)";
        if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
        if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
        if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4 (GSM)";
        if ([platform isEqualToString:@"iPhone3,2"])    return @"iPhone 4 (GSM, 2nd revision)";
        if ([platform isEqualToString:@"iPhone3,3"])    return @"iPhone 4 (Verizon)";
        if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
        if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5 (GSM)";
        if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
        if ([platform isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
        if ([platform isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
        if ([platform isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
        if ([platform isEqualToString:@"iPhone8,1"])    return @"iPhone 6s";
        if ([platform isEqualToString:@"iPhone8,2"])    return @"iPhone 6s Plus";
        if ([platform isEqualToString:@"iPhone8,4"])    return @"iPhone SE";
        if ([platform isEqualToString:@"iPhone9,1"])    return @"iPhone 7 (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone9,3"])    return @"iPhone 7 (GSM)";
        if ([platform isEqualToString:@"iPhone9,2"])    return @"iPhone 7 Plus (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone9,4"])    return @"iPhone 7 Plus (GSM)";
        if ([platform isEqualToString:@"iPhone10,1"])   return @"iPhone 8 (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone10,4"])   return @"iPhone 8 (GSM)";
        if ([platform isEqualToString:@"iPhone10,2"])   return @"iPhone 8 Plus (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone10,5"])   return @"iPhone 8 Plus (GSM)";
        if ([platform isEqualToString:@"iPhone10,3"])   return @"iPhone X (GSM+CDMA)";
        if ([platform isEqualToString:@"iPhone10,6"])   return @"iPhone X (GSM)";
        if ([platform isEqualToString:@"iPhone11,2"])   return @"iPhone XS";
        if ([platform isEqualToString:@"iPhone11,6"])   return @"iPhone XS Max";
        if ([platform isEqualToString:@"iPhone11,8"])   return @"iPhone XR";
        if ([platform isEqualToString:@"iPhone12,1"])   return @"iPhone 11";
        if ([platform isEqualToString:@"iPhone12,3"])   return @"iPhone 11 Pro";
        if ([platform isEqualToString:@"iPhone12,5"])   return @"iPhone 11 Pro Max";
        if ([platform isEqualToString:@"iPhone12,8"])   return @"iPhone SE (2nd generation)";
        if ([platform isEqualToString:@"iPhone13,1"])   return @"iPhone 12 mini";
        if ([platform isEqualToString:@"iPhone13,2"])   return @"iPhone 12";
        if ([platform isEqualToString:@"iPhone13,3"])   return @"iPhone 12 Pro";
        if ([platform isEqualToString:@"iPhone13,4"])   return @"iPhone 12 Pro Max";
        
        //iPod Touch
        if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch (1st generation)";
        if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch (2nd generation)";
        if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch (3rd generation)";
        if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch (4th generation)";
        if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch (5th generation)";
        if ([platform isEqualToString:@"iPod7,1"])      return @"iPod Touch (6th generation)";
        if ([platform isEqualToString:@"iPod9,1"])      return @"iPod Touch (7th generation) (2019)";
        
        //iPad
        if ([platform isEqualToString:@"iPad1,1"])      return @"iPad (1st generation)";
        if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (Wi-Fi)";
        if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
        if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
        if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2 (Wi-Fi, Mid 2012)";
        if ([platform isEqualToString:@"iPad3,1"])      return @"iPad (3rd generation) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad3,2"])      return @"iPad (3rd generation) (GSM+CDMA)";
        if ([platform isEqualToString:@"iPad3,3"])      return @"iPad (3rd generation) (GSM)";
        if ([platform isEqualToString:@"iPad3,4"])      return @"iPad (4th generation) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad3,5"])      return @"iPad (4th generation) (GSM)";
        if ([platform isEqualToString:@"iPad3,6"])      return @"iPad (4th generation) (GSM+CDMA)";
        if ([platform isEqualToString:@"iPad6,11"])     return @"iPad (5th generation) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad6,12"])     return @"iPad (5th generation) (Cellular)";
        if ([platform isEqualToString:@"iPad7,5"])      return @"iPad (6th generation) (2018) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad7,6"])      return @"iPad (6th generation) (2018) (Cellular)";
        if ([platform isEqualToString:@"iPad7,11"])     return @"iPad (7th generation) (2019) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad7,12"])     return @"iPad (7th generation) (2019) (Cellular)";
        if ([platform isEqualToString:@"iPad11,6"])     return @"iPad (8th generation) (2020) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad11,7"])     return @"iPad (8th generation) (2020) (Cellular)";
        
        //iPad Air
        if ([platform isEqualToString:@"iPad4,1"])      return @"iPad Air (Wi-Fi)";
        if ([platform isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
        if ([platform isEqualToString:@"iPad4,3"])      return @"iPad Air (China)";
        if ([platform isEqualToString:@"iPad5,3"])      return @"iPad Air 2 (Wi-Fi)";
        if ([platform isEqualToString:@"iPad5,4"])      return @"iPad Air 2 (Cellular)";
        if ([platform isEqualToString:@"iPad11,3"])     return @"iPad Air (3rd generation) (2019) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad11,4"])     return @"iPad Air (3rd generation) (2019) (Cellular)";
        if ([platform isEqualToString:@"iPad13,1"])     return @"iPad Air (4th generation) (2020) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad13,2"])     return @"iPad Air (4th generation) (2020) (Cellular)";
        
        //iPad Pro
        if ([platform isEqualToString:@"iPad6,3"])      return @"iPad Pro 9.7\" (Wi-Fi)";
        if ([platform isEqualToString:@"iPad6,4"])      return @"iPad Pro 9.7\" (Cellular)";
        if ([platform isEqualToString:@"iPad6,7"])      return @"iPad Pro 12.9\" (Wi-Fi)";
        if ([platform isEqualToString:@"iPad6,8"])      return @"iPad Pro 12.9\" (Cellular)";
        if ([platform isEqualToString:@"iPad7,1"])      return @"iPad Pro 12.9\" (2nd generation) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad7,2"])      return @"iPad Pro 12.9\" (2nd generation) (Cellular)";
        if ([platform isEqualToString:@"iPad7,3"])      return @"iPad Pro 10.5\" (Wi-Fi)";
        if ([platform isEqualToString:@"iPad7,4"])      return @"iPad Pro 10.5\" (Cellular)";
        if ([platform isEqualToString:@"iPad8,1"])      return @"iPad Pro 11\" (2018) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad8,2"])      return @"iPad Pro 11\" (2018) (Wi-Fi, 1TB)";
        if ([platform isEqualToString:@"iPad8,3"])      return @"iPad Pro 11\" (2018) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad8,4"])      return @"iPad Pro 11\" (2018) (Cellular)";
        if ([platform isEqualToString:@"iPad8,5"])      return @"iPad Pro 12.9\" (3rd generation) (2018) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad8,6"])      return @"iPad Pro 12.9\" (3rd generation) (2018) (Cellular)";
        if ([platform isEqualToString:@"iPad8,7"])      return @"iPad Pro 12.9\" (3rd generation) (2018) (Wi-Fi, 1TB)";
        if ([platform isEqualToString:@"iPad8,8"])      return @"iPad Pro 12.9\" (3rd generation) (2018) (Cellular, 1TB)";
        if ([platform isEqualToString:@"iPad8,9"])      return @"iPad Pro 11\" (2nd generation) (2020) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad8,10"])     return @"iPad Pro 11\" (2nd generation) (2020) (Cellular)";
        if ([platform isEqualToString:@"iPad8,11"])     return @"iPad Pro 12.9\" (4th generation) (2020) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad8,12"])     return @"iPad Pro 12.9\" (4th generation) (2020) (Cellular)";
        
        //iPad mini
        if ([platform isEqualToString:@"iPad2,5"])      return @"iPad mini (Wi-Fi)";
        if ([platform isEqualToString:@"iPad2,6"])      return @"iPad mini (GSM)";
        if ([platform isEqualToString:@"iPad2,7"])      return @"iPad mini (GSM+CDMA)";
        if ([platform isEqualToString:@"iPad4,4"])      return @"iPad mini 2 (Wi-Fi)";
        if ([platform isEqualToString:@"iPad4,5"])      return @"iPad mini 2 (Cellular)";
        if ([platform isEqualToString:@"iPad4,6"])      return @"iPad mini 2 (China)";
        if ([platform isEqualToString:@"iPad4,7"])      return @"iPad mini 3 (Wi-Fi)";
        if ([platform isEqualToString:@"iPad4,8"])      return @"iPad mini 3 (Cellular)";
        if ([platform isEqualToString:@"iPad4,9"])      return @"iPad mini 3 (China)";
        if ([platform isEqualToString:@"iPad5,1"])      return @"iPad mini 4 (Wi-Fi)";
        if ([platform isEqualToString:@"iPad5,2"])      return @"iPad mini 4 (Cellular)";
        if ([platform isEqualToString:@"iPad11,1"])     return @"iPad mini (5th generation) (2019) (Wi-Fi)";
        if ([platform isEqualToString:@"iPad11,2"])     return @"iPad mini (5th generation) (2019) (Cellular)";
        
        //Apple TV
        if ([platform isEqualToString:@"AppleTV2,1"])   return @"Apple TV 2G";
        if ([platform isEqualToString:@"AppleTV3,1"])   return @"Apple TV 3";
        if ([platform isEqualToString:@"AppleTV3,2"])   return @"Apple TV 3 (2013)";
        if ([platform isEqualToString:@"AppleTV5,3"])   return @"Apple TV 4";
        if ([platform isEqualToString:@"AppleTV6,2"])   return @"Apple TV 4K";
        
        //Apple Watch
        if ([platform isEqualToString:@"Watch1,1"])     return @"Apple Watch (1st generation) (38mm)";
        if ([platform isEqualToString:@"Watch1,2"])     return @"Apple Watch (1st generation) (42mm)";
        if ([platform isEqualToString:@"Watch2,6"])     return @"Apple Watch Series 1 (38mm)";
        if ([platform isEqualToString:@"Watch2,7"])     return @"Apple Watch Series 1 (42mm)";
        if ([platform isEqualToString:@"Watch2,3"])     return @"Apple Watch Series 2 (38mm)";
        if ([platform isEqualToString:@"Watch2,4"])     return @"Apple Watch Series 2 (42mm)";
        if ([platform isEqualToString:@"Watch3,1"])     return @"Apple Watch Series 3 (38mm Cellular)";
        if ([platform isEqualToString:@"Watch3,2"])     return @"Apple Watch Series 3 (42mm Cellular)";
        if ([platform isEqualToString:@"Watch3,3"])     return @"Apple Watch Series 3 (38mm)";
        if ([platform isEqualToString:@"Watch3,4"])     return @"Apple Watch Series 3 (42mm)";
        if ([platform isEqualToString:@"Watch4,1"])     return @"Apple Watch Series 4 (40mm)";
        if ([platform isEqualToString:@"Watch4,2"])     return @"Apple Watch Series 4 (44mm)";
        if ([platform isEqualToString:@"Watch4,3"])     return @"Apple Watch Series 4 (40mm Cellular)";
        if ([platform isEqualToString:@"Watch4,4"])     return @"Apple Watch Series 4 (44mm Cellular)";
        if ([platform isEqualToString:@"Watch5,1"])     return @"Apple Watch Series 5 (40mm)";
        if ([platform isEqualToString:@"Watch5,2"])     return @"Apple Watch Series 5 (44mm)";
        if ([platform isEqualToString:@"Watch5,3"])     return @"Apple Watch Series 5 (40mm Cellular)";
        if ([platform isEqualToString:@"Watch5,4"])     return @"Apple Watch Series 5 (44mm Cellular)";
        if ([platform isEqualToString:@"Watch6,1"])     return @"Apple Watch Series 6 (40mm)";
        if ([platform isEqualToString:@"Watch6,2"])     return @"Apple Watch Series 6 (44mm)";
        if ([platform isEqualToString:@"Watch6,3"])     return @"Apple Watch Series 6 (40mm Cellular)";
        if ([platform isEqualToString:@"Watch6,4"])     return @"Apple Watch Series 6 (44mm Cellular)";
        if ([platform isEqualToString:@"Watch5,9"])     return @"Apple Watch SE (40mm)";
        if ([platform isEqualToString:@"Watch5,10"])    return @"Apple Watch SE (44mm)";
        if ([platform isEqualToString:@"Watch5,11"])    return @"Apple Watch SE (40mm Cellular)";
        if ([platform isEqualToString:@"Watch5,12"])    return @"Apple Watch SE (44mm Cellular)";
        
        //Simulator
        if ([platform isEqualToString:@"i386"])         return @"Simulator";
        if ([platform isEqualToString:@"x86_64"])       return @"Simulator";
    
    return platform;
}

You can test it using following code:

NSLog(@"Current device is: %@", [self userDeviceName]);

More usable

#include <sys/types.h>
#include <sys/sysctl.h>

@interface UIDevice(Hardware)

- (NSString *) platform;

- (BOOL)hasRetinaDisplay;

- (BOOL)hasMultitasking;

- (BOOL)hasCamera;

@end

@implementation UIDevice(Hardware)

- (NSString *) platform{
    int mib[2];
size_t len;
char *machine;

mib[0] = CTL_HW;
mib[1] = HW_MACHINE;
sysctl(mib, 2, NULL, &len, NULL, 0);
machine = malloc(len);
sysctl(mib, 2, machine, &len, NULL, 0);

    NSString *platform = [NSString stringWithCString:machine encoding:NSASCIIStringEncoding];
    free(machine);
return platform;
}

- (BOOL)hasRetinaDisplay {
    NSString *platform = [self platform];
    BOOL ret = YES;
    if ([platform isEqualToString:@"iPhone1,1"]) {
        ret = NO;
    }
    else
        if ([platform isEqualToString:@"iPhone1,2"])    ret = NO;
    else 
        if ([platform isEqualToString:@"iPhone2,1"])    ret = NO;
    else 
        if ([platform isEqualToString:@"iPod1,1"])      ret = NO;
    else
        if ([platform isEqualToString:@"iPod2,1"])      ret = NO;
    else
        if ([platform isEqualToString:@"iPod3,1"])      ret = NO;
    return ret;
}

- (BOOL)hasMultitasking {
    if ([self respondsToSelector:@selector(isMultitaskingSupported)]) {
        return [self isMultitaskingSupported];
    }
    return NO;
}

- (BOOL)hasCamera {
   BOOL ret = NO;
   // check camera availability
   return ret;
}

@end

you can reading properties with 

NSLog(@"platform %@, retita %@, multitasking %@", [[UIDevice currentDevice] platform], [[UIDevice currentDevice] hasRetinaDisplay] ? @"YES" : @"NO" , [[UIDevice currentDevice] hasMultitasking] ? @"YES" : @"NO");

The possible vales of

[[UIDevice currentDevice] model];

are iPod touch, iPhone, iPhone Simulator, iPad, iPad Simulator

If you want to know which hardware iOS is ruining on like iPhone3, iPhone4, iPhone5 etc below is the code for that

NOTE: The below code may not contain all device's string, I'm with other guys are maintaining the same code on GitHub so please take the latest code from there

Objective-C : GitHub/DeviceUtil

Swift : GitHub/DeviceGuru

#include <sys/types.h>
#include <sys/sysctl.h>

- (NSString*)hardwareDescription {
    NSString *hardware = [self hardwareString];
    if ([hardware isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";
    if ([hardware isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
    if ([hardware isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
    if ([hardware isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";
    if ([hardware isEqualToString:@"iPhone5,1"]) return @"iPhone 5";
    if ([hardware isEqualToString:@"iPod1,1"]) return @"iPodTouch 1G";
    if ([hardware isEqualToString:@"iPod2,1"]) return @"iPodTouch 2G";
    if ([hardware isEqualToString:@"iPad1,1"]) return @"iPad";
    if ([hardware isEqualToString:@"iPad2,6"]) return @"iPad Mini";
    if ([hardware isEqualToString:@"iPad4,1"]) return @"iPad Air WIFI";
    //there are lots of other strings too, checkout the github repo
    //link is given at the top of this answer

    if ([hardware isEqualToString:@"i386"]) return @"Simulator";
    if ([hardware isEqualToString:@"x86_64"]) return @"Simulator";

    return nil;
}

- (NSString*)hardwareString {
    size_t size = 100;
    char *hw_machine = malloc(size);
    int name[] = {CTL_HW,HW_MACHINE};
    sysctl(name, 2, hw_machine, &size, NULL, 0);
    NSString *hardware = [NSString stringWithUTF8String:hw_machine];
    free(hw_machine);
    return hardware;
}

Please feel free to use this class (gist @ github)

CODE REMOVED AND RELOCATED TO

https://gist.github.com/1323251

UPDATE (01/14/11)

Obviously, this code is a bit out of date by now, but it can certainly be updated using the code on this thread provided by Brian Robbins which includes similar code with updated models. Thanks for the support on this thread.

NSString *deviceType = [[UIDevice currentDevice] systemName];

I can assure that the above suggested one will work in iOS 7 and above. I believe it will work in iOS 6 too. But am not sure about that.

The possible vales of

[[UIDevice currentDevice] model];

are iPod touch, iPhone, iPhone Simulator, iPad, iPad Simulator

If you want to know which hardware iOS is ruining on like iPhone3, iPhone4, iPhone5 etc below is the code for that

NOTE: The below code may not contain all device's string, I'm with other guys are maintaining the same code on GitHub so please take the latest code from there

Objective-C : GitHub/DeviceUtil

Swift : GitHub/DeviceGuru

#include <sys/types.h>
#include <sys/sysctl.h>

- (NSString*)hardwareDescription {
    NSString *hardware = [self hardwareString];
    if ([hardware isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";
    if ([hardware isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
    if ([hardware isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
    if ([hardware isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";
    if ([hardware isEqualToString:@"iPhone5,1"]) return @"iPhone 5";
    if ([hardware isEqualToString:@"iPod1,1"]) return @"iPodTouch 1G";
    if ([hardware isEqualToString:@"iPod2,1"]) return @"iPodTouch 2G";
    if ([hardware isEqualToString:@"iPad1,1"]) return @"iPad";
    if ([hardware isEqualToString:@"iPad2,6"]) return @"iPad Mini";
    if ([hardware isEqualToString:@"iPad4,1"]) return @"iPad Air WIFI";
    //there are lots of other strings too, checkout the github repo
    //link is given at the top of this answer

    if ([hardware isEqualToString:@"i386"]) return @"Simulator";
    if ([hardware isEqualToString:@"x86_64"]) return @"Simulator";

    return nil;
}

- (NSString*)hardwareString {
    size_t size = 100;
    char *hw_machine = malloc(size);
    int name[] = {CTL_HW,HW_MACHINE};
    sysctl(name, 2, hw_machine, &size, NULL, 0);
    NSString *hardware = [NSString stringWithUTF8String:hw_machine];
    free(hw_machine);
    return hardware;
}

Updated platform strings for iPad Air 2 and iPad mini 3:

- (NSString *)platformString
{
    NSString *platform = [self platform];

    if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 1G";
    if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,3"])    return @"Verizon iPhone 4";
    if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
    if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5 (GSM)";
    if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
    if ([platform isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
    if ([platform isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
    if ([platform isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
    if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
    if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
    if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
    if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
    if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch 5G";
    if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
    if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
    if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
    if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini (GSM)";
    if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
    if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3 (GSM)";
    if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
    if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4 (GSM)";
    if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";

    if ([platform isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
    if ([platform isEqualToString:@"iPad4,4"])      return @"iPad mini 2G (WiFi)";
    if ([platform isEqualToString:@"iPad4,5"])      return @"iPad mini 2G (Cellular)";

    if ([platform isEqualToString:@"iPad4,7"])      return @"iPad mini 3 (WiFi)";
    if ([platform isEqualToString:@"iPad4,8"])      return @"iPad mini 3 (Cellular)";
    if ([platform isEqualToString:@"iPad4,9"])      return @"iPad mini 3 (China Model)";

    if ([platform isEqualToString:@"iPad5,3"])      return @"iPad Air 2 (WiFi)";
    if ([platform isEqualToString:@"iPad5,4"])      return @"iPad Air 2 (Cellular)";
    if ([platform isEqualToString:@"iPad6,8"])      return @"iPad Pro";

    if ([platform isEqualToString:@"i386"])         return @"Simulator";
    if ([platform isEqualToString:@"x86_64"])       return @"Simulator";

    return platform;
}

I know an answer has been ticked already, but for future reference, you could always use the device screen size to figure out which device it is like so:

if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {

    CGSize result = [[UIScreen mainScreen] bounds].size;

    if (result.height == 480) {
        // 3.5 inch display - iPhone 4S and below
        NSLog(@"Device is an iPhone 4S or below");
    }

    else if (result.height == 568) {
        // 4 inch display - iPhone 5
        NSLog(@"Device is an iPhone 5/S/C");
    }

    else if (result.height == 667) {
        // 4.7 inch display - iPhone 6
        NSLog(@"Device is an iPhone 6");
    }

    else if (result.height == 736) {
        // 5.5 inch display - iPhone 6 Plus
        NSLog(@"Device is an iPhone 6 Plus");
    }
} 

else if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
       // iPad 9.7 or 7.9 inch display.
       NSLog(@"Device is an iPad.");
}

You can check GBDeviceInfo on GitHub, also available via CocoaPods. It provides simple API for detecting various properties with support of all latest devices:

  • Device family

[GBDeviceInfo deviceDetails].family == GBDeviceFamilyiPhone;

  • Device model

[GBDeviceInfo deviceDetails].model == GBDeviceModeliPhone6.

For more see Readme.

Dutchie432 and Brian Robbins have provided great solutions. But there's still one model missing, the Verizon iPhone 4. Here's the missing line.

if ([platform isEqualToString:@"iPhone3,2"])    return @"iPhone 4"; //Verizon

I took it a bit further and converted the big "isEqualToString" block into a classification of bit masks for the device type, the generation, and that other qualifier after the comma (I'm calling it the sub generation). It is wrapped in a class with a singleton call SGPlatform which avoids a lot of repetitive string operations. Code is available https://github.com/danloughney/spookyGroup

The class lets you do things like this:

if ([SGPlatform iPad] && [SGPlatform generation] > 3) {
    // set for high performance
}

and 

switch ([SGPlatform deviceMask]) {
case DEVICE_IPHONE:
    break;
case DEVICE_IPAD:
    break;
case DEVICE_IPAD_MINI:
    break;
}

The classification of the devices is in the platformBits method. That method should be very familiar to the readers of this thread. I have classified the devices by their type and generation because I'm mostly interested in the overall performance, but the source can be tweaked to provide any classification that you are interested in, retina screen, networking capabilities, etc..

How about this code, if new version was released, you will identifier with the last know device

- (NSString *)getModel {
    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);
    char *model = malloc(size);
    sysctlbyname("hw.machine", model, &size, NULL, 0);
    NSString *sDeviceModel = [NSString stringWithCString:model encoding:NSUTF8StringEncoding];
    free(model);                              
    if ([sDeviceModel isEqual:@"i386"])      return @"Simulator";  //iPhone Simulator
    if ([sDeviceModel isEqual:@"iPhone1,1"]) return @"iPhone1G";   //iPhone 1G
    if ([sDeviceModel isEqual:@"iPhone1,2"]) return @"iPhone3G";   //iPhone 3G
    if ([sDeviceModel isEqual:@"iPhone2,1"]) return @"iPhone3GS";  //iPhone 3GS
    if ([sDeviceModel isEqual:@"iPhone3,1"]) return @"iPhone3GS";  //iPhone 4 - AT&T
    if ([sDeviceModel isEqual:@"iPhone3,2"]) return @"iPhone3GS";  //iPhone 4 - Other carrier
    if ([sDeviceModel isEqual:@"iPhone3,3"]) return @"iPhone4";    //iPhone 4 - Other carrier
    if ([sDeviceModel isEqual:@"iPhone4,1"]) return @"iPhone4S";   //iPhone 4S
    if ([sDeviceModel isEqual:@"iPod1,1"])   return @"iPod1stGen"; //iPod Touch 1G
    if ([sDeviceModel isEqual:@"iPod2,1"])   return @"iPod2ndGen"; //iPod Touch 2G
    if ([sDeviceModel isEqual:@"iPod3,1"])   return @"iPod3rdGen"; //iPod Touch 3G
    if ([sDeviceModel isEqual:@"iPod4,1"])   return @"iPod4thGen"; //iPod Touch 4G
    if ([sDeviceModel isEqual:@"iPad1,1"])   return @"iPadWiFi";   //iPad Wifi
    if ([sDeviceModel isEqual:@"iPad1,2"])   return @"iPad3G";     //iPad 3G
    if ([sDeviceModel isEqual:@"iPad2,1"])   return @"iPad2";      //iPad 2 (WiFi)
    if ([sDeviceModel isEqual:@"iPad2,2"])   return @"iPad2";      //iPad 2 (GSM)
    if ([sDeviceModel isEqual:@"iPad2,3"])   return @"iPad2";      //iPad 2 (CDMA)

    NSString *aux = [[sDeviceModel componentsSeparatedByString:@","] objectAtIndex:0];

//If a newer version exist
    if ([aux rangeOfString:@"iPhone"].location!=NSNotFound) {
        int version = [[aux stringByReplacingOccurrencesOfString:@"iPhone" withString:@""] intValue];
        if (version == 3) return @"iPhone4"
        if (version >= 4) return @"iPhone4s";

    }
    if ([aux rangeOfString:@"iPod"].location!=NSNotFound) {
        int version = [[aux stringByReplacingOccurrencesOfString:@"iPod" withString:@""] intValue];
        if (version >=4) return @"iPod4thGen";
    }
    if ([aux rangeOfString:@"iPad"].location!=NSNotFound) {
        int version = [[aux stringByReplacingOccurrencesOfString:@"iPad" withString:@""] intValue];
        if (version ==1) return @"iPad3G";
        if (version >=2) return @"iPad2";
    }
    //If none was found, send the original string
    return sDeviceModel;
}

- (BOOL)deviceiPhoneOriPod
  {
    NSString *deviceType = [UIDevice currentDevice].model;
    if([deviceType rangeOfString:@"iPhone"].location!=NSNotFound)
      return YES;
    else
      return NO;
  }

Below mentioned code snippet should help :

 if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
   // iPhone device
 }
 else if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
   // iPad device
 }
 else {
  // Other device i.e. iPod
 }

#import <sys/utsname.h> 

NSString *iPhone = [self iPhoneVersion]; 

-(NSString*)iPhoneVersion
{
   NSString *platform;
   struct utsname systemInfo;
   uname(&systemInfo);
   platform = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];

   if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 1G";
   if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
   if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
   if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
   if ([platform isEqualToString:@"iPhone3,3"])    return @"VerizoniPhone 4";
   if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
   if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5 (GSM)";
   if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
   if ([platform isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
   if ([platform isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
   if ([platform isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
   if ([platform isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
   if ([platform isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
   if ([platform isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
   if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
   if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
   if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
   if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
   if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch 5G";
   if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
   if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
   if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
   if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
   if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2 (WiFi)";
   if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
   if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini (GSM)";
   if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
   if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
   if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
   if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3 (GSM)";
   if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
   if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4 (GSM)";
   if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";
   if ([platform isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";
   if ([platform isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
   if ([platform isEqualToString:@"iPad4,3"])      return @"iPad Air";
   if ([platform isEqualToString:@"iPad4,4"])      return @"iPad Mini 2G (WiFi)";
   if ([platform isEqualToString:@"iPad4,5"])      return @"iPad Mini 2G (Cellular)";
   if ([platform isEqualToString:@"iPad4,6"])      return @"iPad Mini 2G";
   if ([platform isEqualToString:@"iPad4,7"])      return @"iPad Mini 3 (WiFi)";
   if ([platform isEqualToString:@"iPad4,8"])      return @"iPad Mini 3 (Cellular)";
   if ([platform isEqualToString:@"iPad4,9"])      return @"iPad Mini 3 (China)";
   if ([platform isEqualToString:@"iPad5,3"])      return @"iPad Air 2 (WiFi)";
   if ([platform isEqualToString:@"iPad5,4"])      return @"iPad Air 2 (Cellular)";
   if ([platform isEqualToString:@"AppleTV2,1"])   return @"Apple TV 2G";
   if ([platform isEqualToString:@"AppleTV3,1"])   return @"Apple TV 3";
   if ([platform isEqualToString:@"AppleTV3,2"])   return @"Apple TV 3 (2013)";
   if ([platform isEqualToString:@"i386"])         return @"Simulator";
   if ([platform isEqualToString:@"x86_64"])       return @"Simulator";
   return platform;
}

I know an answer has been ticked already, but for future reference, you could always use the device screen size to figure out which device it is like so:

if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {

    CGSize result = [[UIScreen mainScreen] bounds].size;

    if (result.height == 480) {
        // 3.5 inch display - iPhone 4S and below
        NSLog(@"Device is an iPhone 4S or below");
    }

    else if (result.height == 568) {
        // 4 inch display - iPhone 5
        NSLog(@"Device is an iPhone 5/S/C");
    }

    else if (result.height == 667) {
        // 4.7 inch display - iPhone 6
        NSLog(@"Device is an iPhone 6");
    }

    else if (result.height == 736) {
        // 5.5 inch display - iPhone 6 Plus
        NSLog(@"Device is an iPhone 6 Plus");
    }
} 

else if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
       // iPad 9.7 or 7.9 inch display.
       NSLog(@"Device is an iPad.");
}

NSString *deviceType = [UIDevice currentDevice].model;

Just adding the iPhone 4S device code to this thread...

The iPhone 4S will return the string @"iPhone4,1".

This is an update for UIDeviceHardware.m from the answer above.

- (NSString *)platformString
{
    NSString *platform = [self platform];

    if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 1G";
    if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,3"])    return @"Verizon iPhone 4";
    if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
    if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5 (GSM)";
    if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
    if ([platform isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
    if ([platform isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone7,1"])    return @"iPhone 6";
    if ([platform isEqualToString:@"iPhone7,2"])    return @"iPhone 6 Plus";
    if ([platform isEqualToString:@"iPhone8,1"])    return @"iPhone 6s";
    if ([platform isEqualToString:@"iPhone8,2"])    return @"iPhone 6s Plus";
    if ([platform isEqualToString:@"iPhone8,4"])    return @"iPhone SE";
    if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
    if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
    if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
    if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
    if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch 5G";
    if ([platform isEqualToString:@"iPod7,1"])      return @"iPod Touch 6G";
    if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
    if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
    if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
    if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini (GSM)";
    if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
    if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3 (GSM)";
    if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
    if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4 (GSM)";
    if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";
    if ([platform isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
    if ([platform isEqualToString:@"iPad4,4"])      return @"iPad mini 2G (WiFi)";
    if ([platform isEqualToString:@"iPad4,5"])      return @"iPad mini 2G (Cellular)";
    if ([platform isEqualToString:@"iPad5,1"])      return @"iPad mini 4 (WiFi)";
    if ([platform isEqualToString:@"iPad5,2"])      return @"iPad mini 4 (Cellular)";
    if ([platform isEqualToString:@"iPad5,3"])      return @"iPad Air 2 (WiFi)";
    if ([platform isEqualToString:@"iPad5,4"])      return @"iPad Air 2 (Cellular)";
    if ([platform isEqualToString:@"iPad6,3"])      return @"iPad Pro 9.7 inch (WiFi)";
    if ([platform isEqualToString:@"iPad6,4"])      return @"iPad Pro 9.7 inch (Cellular)";
    if ([platform isEqualToString:@"iPad6,7"])      return @"iPad Pro 12.9 inch (WiFi)";
    if ([platform isEqualToString:@"iPad6,8"])      return @"iPad Pro 12.9 inch (Cellular)";
    if ([platform isEqualToString:@"i386"])         return @"Simulator";
    if ([platform isEqualToString:@"x86_64"])       return @"Simulator";

    return platform;
}

Below mentioned code snippet should help :

 if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
   // iPhone device
 }
 else if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
   // iPad device
 }
 else {
  // Other device i.e. iPod
 }

More usable

#include <sys/types.h>
#include <sys/sysctl.h>

@interface UIDevice(Hardware)

- (NSString *) platform;

- (BOOL)hasRetinaDisplay;

- (BOOL)hasMultitasking;

- (BOOL)hasCamera;

@end

@implementation UIDevice(Hardware)

- (NSString *) platform{
    int mib[2];
size_t len;
char *machine;

mib[0] = CTL_HW;
mib[1] = HW_MACHINE;
sysctl(mib, 2, NULL, &len, NULL, 0);
machine = malloc(len);
sysctl(mib, 2, machine, &len, NULL, 0);

    NSString *platform = [NSString stringWithCString:machine encoding:NSASCIIStringEncoding];
    free(machine);
return platform;
}

- (BOOL)hasRetinaDisplay {
    NSString *platform = [self platform];
    BOOL ret = YES;
    if ([platform isEqualToString:@"iPhone1,1"]) {
        ret = NO;
    }
    else
        if ([platform isEqualToString:@"iPhone1,2"])    ret = NO;
    else 
        if ([platform isEqualToString:@"iPhone2,1"])    ret = NO;
    else 
        if ([platform isEqualToString:@"iPod1,1"])      ret = NO;
    else
        if ([platform isEqualToString:@"iPod2,1"])      ret = NO;
    else
        if ([platform isEqualToString:@"iPod3,1"])      ret = NO;
    return ret;
}

- (BOOL)hasMultitasking {
    if ([self respondsToSelector:@selector(isMultitaskingSupported)]) {
        return [self isMultitaskingSupported];
    }
    return NO;
}

- (BOOL)hasCamera {
   BOOL ret = NO;
   // check camera availability
   return ret;
}

@end

you can reading properties with 

NSLog(@"platform %@, retita %@, multitasking %@", [[UIDevice currentDevice] platform], [[UIDevice currentDevice] hasRetinaDisplay] ? @"YES" : @"NO" , [[UIDevice currentDevice] hasMultitasking] ? @"YES" : @"NO");

Update platform string.

// Created from this thread: https://gist.github.com/Jaybles/1323251

// Apple TV
if ([platform isEqualToString:@"AppleTV2,1"])   return @"Apple TV 2G";
if ([platform isEqualToString:@"AppleTV3,1"])   return @"Apple TV 3G";
if ([platform isEqualToString:@"AppleTV3,2"])   return @"Apple TV 3G";
if ([platform isEqualToString:@"AppleTV5,3"])   return @"Apple TV 4G";

// Apple Watch
if ([platform isEqualToString:@"Watch1,1"])     return @"Apple Watch";
if ([platform isEqualToString:@"Watch1,2"])     return @"Apple Watch";

// iPhone
if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 2G";
if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4 (GSM)";
if ([platform isEqualToString:@"iPhone3,2"])    return @"iPhone 4 (GSM/2012)";
if ([platform isEqualToString:@"iPhone3,3"])    return @"iPhone 4 (CDMA)";
if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5 (GSM)";
if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (Global)";
if ([platform isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
if ([platform isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (Global)";
if ([platform isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
if ([platform isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (Global)";
if ([platform isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
if ([platform isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
if ([platform isEqualToString:@"iPhone8,1"])    return @"iPhone 6s";
if ([platform isEqualToString:@"iPhone8,2"])    return @"iPhone 6s Plus";
if ([platform isEqualToString:@"iPhone8,4"])    return @"iPhone SE";
if ([platform isEqualToString:@"iPhone9,1"])    return @"iPhone 7 (Global)";
if ([platform isEqualToString:@"iPhone9,3"])    return @"iPhone 7 (GSM)";
if ([platform isEqualToString:@"iPhone9,2"])    return @"iPhone 7 Plus (Global)";
if ([platform isEqualToString:@"iPhone9,4"])    return @"iPhone 7 Plus (GSM)";

// iPad
if ([platform isEqualToString:@"iPad1,1"])      return @"iPad 1";
if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";
if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2 (Mid 2012)";
if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (CDMA)";
if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3 (GSM)";
if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4 (GSM)";
if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (Global)";

// iPad Air
if ([platform isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";
if ([platform isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
if ([platform isEqualToString:@"iPad4,3"])      return @"iPad Air (China)";
if ([platform isEqualToString:@"iPad5,3"])      return @"iPad Air 2 (WiFi)";
if ([platform isEqualToString:@"iPad5,4"])      return @"iPad Air 2 (Cellular)";

// iPad Mini
if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini (GSM)";
if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (Global)";
if ([platform isEqualToString:@"iPad4,4"])      return @"iPad Mini 2 (WiFi)";
if ([platform isEqualToString:@"iPad4,5"])      return @"iPad Mini 2 (Cellular)";
if ([platform isEqualToString:@"iPad4,6"])      return @"iPad Mini 2 (China)";
if ([platform isEqualToString:@"iPad4,7"])      return @"iPad Mini 3 (WiFi)";
if ([platform isEqualToString:@"iPad4,8"])      return @"iPad Mini 3 (Cellular)";
if ([platform isEqualToString:@"iPad4,9"])      return @"iPad Mini 3 (China)";
if ([platform isEqualToString:@"iPad5,1"])      return @"iPad Mini 4 (WiFi)";
if ([platform isEqualToString:@"iPad5,2"])      return @"iPad Mini 4 (Cellular)";

// iPad Pro
if ([platform isEqualToString:@"iPad6,3"])      return @"iPad Pro (9.7 inch/WiFi)";
if ([platform isEqualToString:@"iPad6,4"])      return @"iPad Pro (9.7 inch/Cellular)";
if ([platform isEqualToString:@"iPad6,7"])      return @"iPad Pro (12.9 inch/WiFi)";
if ([platform isEqualToString:@"iPad6,8"])      return @"iPad Pro (12.9 inch/Cellular)";

// iPod
if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch 5G";
if ([platform isEqualToString:@"iPod7,1"])      return @"iPod Touch 6G";

// Simulator
if ([platform isEqualToString:@"i386"])         return @"Simulator";
if ([platform isEqualToString:@"x86_64"])       return @"Simulator";

For simple comparison I always like macro:

#define IS_IPOD [[UIDevice currentDevice].model containsString:@"iPod"]
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)

It's simple and easy to use.

I'd like to add that to retrieve the front and enclosure color of the device there's a private API:

UIDevice *device = [UIDevice currentDevice];
SEL selector = NSSelectorFromString([device.systemVersion hasPrefix:@"7"] ? @"_deviceInfoForKey:" :  @"deviceInfoForKey:");
if ([device respondsToSelector:selector]) {
    NSLog(@"DeviceColor: %@ DeviceEnclosureColor: %@", [device performSelector:selector withObject:@"DeviceColor"], [device performSelector:selector withObject:@"DeviceEnclosureColor"]);
}

I've blogged about this and provide a sample app:

http://www.futuretap.com/blog/device-colors/

You can check GBDeviceInfo on GitHub, also available via CocoaPods. It provides simple API for detecting various properties with support of all latest devices:

  • Device family

[GBDeviceInfo deviceDetails].family == GBDeviceFamilyiPhone;

  • Device model

[GBDeviceInfo deviceDetails].model == GBDeviceModeliPhone6.

For more see Readme.

NSString *deviceType = [UIDevice currentDevice].model;

I like Erica Sadun's stuff. She includes AppleTV devices and others you might not think of.

https://github.com/erica/uidevice-extension/blob/master/UIDevice-Hardware.h

Source: Stackoverflow.com

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