- SET UP A SECURE SCREEN LOCK:Â Press the Rotating Side button from the clock-screen.
- Select Settings.Â
- Select Personalization.
- Select Screen lock.
- Select the desired screen lock type and follow the prompts.
Note: For this tutorial, PIN was selected. - CHANGE SECURITY TYPE: From the Personalization screen, select Screen lock > Check icon > Enter your existing lock code >  select desired security lock type > follow the prompts.
- DISABLE SECURITY LOCK: Select Lock screen now in the Personalization screen.
- Select the Next icon to verify your screen lock. Enter your current lock code, select the Checkmark icon and then select the Checkmark icon to confirm.
- LOGIN USING SECURITY LOCK: Select the screen to bring up the Lock code screen. Enter the existing lock code and then select then Checkmark icon to confirm.
- 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 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.