Your mobile device supports a feature called Smart Alert. Smart Alert is a motion gesture that will cause your device to vibrate when you pick it up and when notifications, such as missed calls or new messages, are waiting.
You can turn on this feature in the motion settings menu. From the Home screen, touch Menu > Settings > My device > Motions and gestures > Motion. Touch the slider to turn Motion on , if not already turned on. Touch the slider to turn Smart alert on .
There you go