Tap the message icon.

Tap the menu icon.

Tap Settings.

Tap Notifications until the function is turned on.

Tap Sound.

If you want to use one of your mobile phone's default message tones:
Tap Ringtone.

If you want to use one of your own message tones:
Tap Music.

Tap the different message tones to listen to them.

Once you've found a message tone you like, tap APPLY.

Tap the home icon to return to the home screen.