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Cause 2 of 2: The screen lock is turned on
If the screen lock is turned on, you can't use the phone's screen and keys.
Solution: Turn off the screen lock.
Turn on the screen lock
Briefly press On/Off.
Turn off the screen lock
Press and drag the lock icon upwards.
Set automatic screen lock
Slide two fingers downwards starting from the top the screen.
Press the settings icon.
Press the required setting.
Return to the home screen
Press the Home key to return to the home screen.
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