Samsung GT-I9082 - Double-tapping; Rotating

Basics
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Double-tapping
Double-tap the device to move to the top of a list of contacts or emails.
Rotating
While the screen is locked, tap and hold the screen, and then rotate the device to landscape
orientation to launch the camera. To use this motion, on the Home screen, tap
Apps
→
Settings
→
Lock screen
→
Lock screen options , and then drag the Camera quick access
switch to the right.