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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 screen lock on or off
Briefly press On/Off.
Set automatic screen lock
Slide your finger downwards starting from the top of 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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