To adjust the idle time before the screen turns off
1 From your Home screen, tap .
2Find and tap Settings > Display > Sleep.
3 Select an option.
To turn off the screen quickly, briefly press the power key 
.
Screen lock
There are several ways to lock the screen. The security level of each lock type is listed below in order of weakest to strongest:
•Swipe – no protection, but you have quick access to the Home screen
•Face Unlock – unlocks your device when you look at it
•Unlock pattern – draw a simple pattern with your finger to unlock your device
•Unlock PIN – enter a numeric PIN of at least four digits to unlock your device
•Unlock password – enter an
It is very important that you remember your screen unlock pattern, PIN or password. If you forget this information, it may not be possible to restore important data such as contacts and messages.
To set up the Face Unlock feature
1From your Home screen, tap > Settings > Security > Screen lock.
2Tap Face Unlock, then follow the instructions in your device to capture a photo
of your face.
3After your face is successfully captured, tap Continue.
4Select a backup unlock method and follow the instructions in the device to complete the setup.
For best results, capture your face in an indoor area that is well lit but not too bright, and hold the device at eye level.
To unlock the screen using the Face Unlock feature
1Activate the screen.
2Look at your device from the same angle you used to capture your Face Unlock photo.
If the Face Unlock feature fails to recognise your face, you must use the backup unlock method to unlock the screen.
To create a screen lock pattern
1 From your Home screen, tap .
2Find and tap Settings > Security > Screen lock > Pattern.
3 Follow the instructions in your device.
If your lock pattern is rejected five times in a row when you try to unlock your device, you must wait 30 seconds and then try again.
To change the screen lock pattern
1 From your Home screen, tap .
2Find and tap Settings> Security > Screen lock.
3 Draw your screen unlock pattern.
4 Tap Pattern and follow the instructions in your device.
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