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The message tone is the sound you'll hear when you get a text or picture message. Follow these instructions to select a message tone.
Find "ringtones + sounds"
Press arrow right to access the main menu.
Press ringtones + sounds.
Select message tone
Press the field below New text or IM.
Press the playback icon next to the different message tones to hear them.
Once you've found a message tone you like, press the required message tone.
Press the Home key to return to standby mode.