Selecting alert tones
1.Open the menus 
.
2.Select Options, and then select Alerts.
3.Select the Alert Volume pick list and select a volume level.
4.Select the first Vibrate pick list and indicate if you want your phone to vibrate during an incoming alert, when Sound Mode is on.
5.Select the second Vibrate pick list and indicate if you want your phone to vibrate during an incoming alert, when Sound Mode is off.
6.Select the Tones box.
7.Select the Message Tone pick list and select an alert tone for incoming messages.
8.Check any of the following boxes if they appear on your screen:
•Show Message Alerts Dialog: Indicate if you want to receive onscreen alerts when a new message arrives.
•Show Receipts Alerts Dialog: Indicate if you want to receive onscreen alerts when a receipt arrives.
9.Select Done.