Slide your finger downwards starting from the top of the screen.

Tap the settings icon.

Tap Sounds and vibration.

Tap Notification sounds.

Tap Messages notifications.

Tap the indicator in the top right corner of the screen to turn on the function.

Tap Notification sound.

Tap the different message tones to hear them.

Once you've found a message tone you like, tap the Return key.

Tap the Home key to return to the home screen.