Samsung SM-N915F User Manual page 66

Motions & usability features
Smart alert
If you have missed calls or new messages, the device will vibrate when you pick it up.
This feature may not work if the screen is turned on or the device is not on a flat
surface.
If this feature is not activated, open the All apps screen, tap Settings → Motions and
gestures → Smart alert, and then tap the Smart alert switch to activate it.
Mute
Placing palm on screen
Cover the screen with your palm to mute incoming calls or alarms.
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