Notification settings, Notifications, Select ringtone – Google ANDROID 2.3.4 User Manual
Page 237: Vibrate, Notification settings 237

Messaging
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AUG-2.3.4-105
Android User’s Guide
Notification settings
Notifications
Check to receive a notification whenever you receive a new
message. See “Managing notifications” on page 30.
Select ringtone
Opens a dialog where you can select the ringtone to sound when
you receive new message notifications.
Vibrate
Opens a dialog where you can set the phone to vibrate whenever you
receive a new message notification, only in Silent mode, or never.