1. SET UP A SECURE SCREEN LOCK: Press the Rotating Side button from the clock-screen.
   
2. Select Settings. 
   
3. Select Personalization.
   
4. Select Screen lock.
   
5. Select the desired screen lock type and follow the prompts.
   Note: For this tutorial, PIN was selected.
   
6. 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.
   
7. DISABLE SECURITY LOCK: Select Lock screen now in the Personalization screen.
   
8. 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.
   
9. 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.
   
10. 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.