1. From the home screen, press the Right Soft Key.
   
2. Scroll to Messaging, then press the Center Nav Key.
   
3. Scroll to Message Settings, then press the Center Nav Key.
   
4. Scroll to Message Alert then press the Center Nav key.
   
5. Scroll to Sounds then press the Center Nav key.
   
6. Scroll to the desired tone, then press the Center Nav key.