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You can lock the phone screen and keys to avoid activating your phone by mistake.
1. Turn on the screen lock
Briefly press On/Off.
2. Turn off the screen lock
Briefly press On/Off and slide you finger across the screen.
3. Set automatic screen lock
Slide two fingers downwards starting from the top the screen.
Press the settings icon.
Press the required setting.
4. Return to the home screen
Press the Home key to return to the home screen.