You will need to change the configure port of either Apache or Nginx. After you do this you will need to restart the reconfigured servers, using the 'service' command you used.
Apache
Edit
sudo subl /etc/apache2/ports.conf
and change the 80 on the following line to something different :
Listen 80
If you just change the port or add more ports here, you will likely also have to change the VirtualHost statement in
sudo subl /etc/apache2/sites-enabled/000-default.conf
and change the 80 on the following line to something different :
<VirtualHost *:80>
then restart by :
sudo service apache2 restart
Nginx
Edit
/etc/nginx/sites-enabled/default
and change the 80 on the following line :
listen 80;
then restart by :
sudo service nginx restart