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What is the Smart Alert Feature on my Samsung Galaxy S® III?
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 > Motion . Touch the slider to turn Motion on , if not already turned on. Place a check mark next to Smart alert to turn the feature on.