Assign ringtones for each application by following the appropriate steps below:

Messaging
From the Messaging screen, press the Menu Key and touch Settings > Select ringtone. Touch the desired ringtone, and then touch OK.

Gmail or Email
From your Gmail or Email inbox, press the Menu Key and touch Settings (Gmail) or Account settings (Email) > Select ringtone. Touch the desired ringtone, and then touch OK.

Phone
From the home screen, press the Menu Key and touch Settings > Sound & display > Phone ringtone. Touch the desired ringtone, and then touch OK.

Notification
To set the sound that plays for notifications such as calendar and system alerts, from the home screen, press the Menu Key and touch Settings > Sound & display > Notification ringtone. Touch the desired ringtone, and then touch OK.