1. From the home screen, tap Messaging.
   
2. Tap the Menu icon.
   
3. Tap Settings.
   
4. Tap the desired option.
   
5. To change the message notification sound, tap Sound > OK.
   
6. To change the message center number, tap SMSC setting > Edit the SMSC number > OK.
   Note: The AT&T SMSC number should be set to +3123149810.
   
7. To restore default settings, tap Restore default settings > OK.