Find "Phone ringtone"
Slide your finger down the display starting from the top edge of your phone.
Press the settings icon.
Press the settings icon.
Press All.
Press Sound.
Press Phone ringtone.
Select ring tone
If you want to use one of your phone's default ring tones:
Press Ringtone.
Press Ringtone.
If you want to use one of your own ring tones:
Press Music.
Press Music.
Press the different ring tones to listen to them.
Once you've found a ring tone you like, press APPLY.
Return to the home screen
Press the home icon to return to the home screen.