Справочник Пользователя для Samsung Galaxy Mega 2

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Getting started
19
Locking and unlocking the screen
Pressing the Power button turns off the screen and locks it. Also, the screen turns off and 
automatically locks if the device is not used for a specified period.
To unlock the screen, press the Power button or the Home button and flick your finger in any 
direction within the unlock screen area.
You can change the unlock code to unlock the screen. Refer t
 for more information.