1. To lock your device screen, press the Power/Lock key.
   
2. To unlock your device screen, press the Power/Lock key.
   
3. To set up the security lock, swipe down from the top of the screen, then tap the Settings icon.
   
4. Tap Lock screen and security, then tap Screen lock type.
   
5. Tap Desired screen lock type.
   Note: For this example ‘Pattern’ was selected.
   
6. Draw desired pattern and tap CONTINUE.
   
7. Redraw the pattern again and tap CONFIRM.
   
8. Enter a backup PIN and tap CONTINUE.
   
9. Reenter the backup PIN and tap OK.
   Note: To learn more about requesting a device unlock for your AT&T mobile device, visit www.att.com/deviceunlock. 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.