Samsung Galaxy Alpha - Manual (Page 45)

Motions & usability features
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Smart alert
On the Apps screen, tap Settings → Motions and gestures → Smart alert, and then tap the
Smart alert switch to activate it.
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.
Mute/Pause
On the Apps screen, tap Settings → Motions and gestures → Mute/Pause, and then tap the
Mute/Pause switch to activate it.
Covering screen with hand
Cover the screen with your palm to mute incoming calls or alarms, or to pause media
playback.