Notifications: Checkmark this setting to allow your phone to receive a notification in the Status Bar whenever you receive a new message.
New message pop-up: Checkmark this setting to show a pop-up when new messages are received.
Preview: Checkmark this setting to preview message contents when a new message is received.
Notification sound: Tap to select the ringtone to sound when you receive a new message notification.
Vibrate: Tap to to set when the phone will vibrate for a new message notification.
Repeat alert: Tap to set how often the phone will repeat the alert for unread messages.