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1. Press the Power key to turn on the screen.     
2. Drag the    icon to unlock the screen. 
If you've set an unlock PIN, pattern or password, you need to draw the unlock pattern or input the 
password to enter the main interface. (For details, please see Settings > Security > Screen lock).   
Secure your device 
Go to Settings > Security > Screen Lock to apply a lock screen to your device. Locking your device 
will prevent unauthorised use.