Lock or unlock your display, set a screen security lock type (pin, password, pattern, or fingerprint), get your PUK code, or request your device be unlocked.
To learn more about requesting a device unlock for your AT&T mobile device so that it can operate on another compatible wireless network, visit https://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.
In this tutorial, you will learn how to:
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• Set a security lock
• Change lock type
• Change lock screen timeout
• Lock and unlock device
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1. From the Device unlock screen, select the  Settings icon next to Screen lock.
2. Select Lock after screen timeout, then select the desired timeout duration. Â
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• LOG IN USING THE SECURITY LOCK: To use face recognition, raise your device in front of your face to unlock your device.  To use your backup screen lock, swipe up from the bottom of the lock screen, then enter your backup screen lock.
• LOCK DEVICE: Press the Power/Lock button located on the right side of the device.