Samsung Galaxy Alpha - Manual (Page 44)

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Motions & usability features
Motions and gestures
Excessive shaking or impact on the device may result in unintended inputs. Control
motions properly.
Direct call
On the Apps screen, tap Settings → Motions and gestures → Direct call, and then tap the
Direct call switch to activate it.
While viewing call, message, or contact details, pick up and hold the device to your ear to
make a call.