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Here are the steps on how to turn the key lock on or off with your Samsung Galaxy S3.

To manually lock and unlock the screen of your Samsung Galaxy S3, just press and hold down the power button for about 3 seconds. That is the button located on the right side of your phone.

To setup the automatic key lock, do the steps below.
  1. From the home screen, tap on Apps
  2. Tap on Settings
  3. Tap on Display
  4. Tap on Screen Timeout
  5. Select your desired duration of automatic key lock
  6. Press the Home button
Your Samsung Galaxy S3 should now automatically lock after of non-activity in the duration you've selected. 


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