1Press and hold down the power key 
until the device vibrates.
2If your screen goes dark, briefly press the power key 
to activate the screen.
3To unlock the screen, swipe up or down on the screen.
4Enter your SIM card PIN when requested, then select OK.
5Wait a while for the device to start.
Your SIM card PIN is initially supplied by your network operator, but you can change it later from the Settings menu. To correct a mistake made while entering your SIM card PIN, tap 
.
To turn off the device
1Press and hold down the power key 
until the options menu opens.
2In the options menu, tap Power off.
3Tap OK.
It may take a while for the device to shut down.
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.
Screen lock
When your device is on and left idle for a set period of time, the screen darkens to save battery power, and locks automatically. The screen lock prevents unwanted actions on the touchscreen when you are not using it.
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