Samsung Galaxy Note 4 - Manual (Page 55)

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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
While viewing call, message, or contact details, pick up and hold the device to your ear to
make a call.
If this feature is not activated, open the All apps screen, tap Settings → Motions and
gestures → Direct call, and then tap the Direct call switch to activate it.