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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 your 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
Briefly press On/Off and slide you finger right on the screen.
Set automatic screen lock
Press the required setting.
Return to the home screen
Press the Home key to return to the home screen.
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