Find "Msg. alert tone"
Press Menu.
Press Settings.
Press Tones.
Press Msg. alert tone.
Select message tone
Press the required message tone or Open Gallery.
If you select Open Gallery:
Go to the required folder.
Go to the required folder.
Press the different message tones to listen to them.
Once you've found a message tone you like, press Use.
Save and exit
Press Save.
Press Disconnect to return to standby mode.