1. To lock the screen, press the Power/Lock key.
   
2. To unlock, press the Power/Lock key.
   Note: Alternately, you can use Knock On to wake up the device by tapping the screen twice.
   
3. Touch and drag the screen in any direction.
   
4. To enable and use a screen lock, swipe down from the top of the screen, then tap the Settings icon.
   
5. Scroll to, then tap Lock screen.
   
6. Tap Select screen lock.
   
7. Tap the desired screen lock type.
   Note: Knock Code was used for this demonstration.
   
8. Follow the on-screen instructions to complete the screen lock setup.
   
9. From the lock screen, tap the code to unlock.
   
10. To learn more about requesting a device unlock for your AT&T mobile device, visit www.att.com/deviceunlock.
    Note: If your device is locked and is requesting a PUK code, click here for instructions on how to obtain your PUK or PUK2 code to unlock your SIM card.