1, From the iPhone's home screen, tap the Settings app.
2, In Settings, tap Sounds in the third group of options.
3, In Sounds, swipe down to the Sounds and Vibration Patterns section. In that section, look for Ringtone. That displays what you have set as your current iPhone ringtone. Tap it to change that.
4, This menu shows you the list of all the ringtones available on your iPhone.
To get new ringtones, tap the Store button in the top right corner. This will take you to the ringtone section of the iTunes Store where you can stock up on new ringtones.