To force the device to restart
1Remove the SIM and memory card cover.
2Press and hold down the OFF button using the tip of a pen or a similar object.
3After your device vibrates once, release the button. The device restarts automatically.
Locking and unlocking the screen
When your device is on and left idle for a set period of time, the screen darkens to save battery power, and locks automatically. This lock prevents unwanted actions on the touch screen when you are not using it.
To activate the screen
•Briefly press the power key 
. To unlock the screen
•Place a finger on the screen and swipe up or down. To lock the screen
•When the screen is active, briefly press the power key 
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