1. SET UP A SECURE SCREEN LOCK: Select the Settings icon from the home screen.
   Note: To wake the device or put the screen to sleep, press the Power/Lock button. You can also use KnockON. When the device is locked and sleeping, double-tap the center of the screen quickly to wake up the screen. To lock the screen, double-tap an empty area on the Home screen or the status bar in any screen (except on the camera viewfinder).
   
2. Scroll to and select Lock screen then select Select screen lock.
   
3. Select the desired screen lock type.
   Note: For this demonstration, Knock Code was selected.
   
4. Enter your desired Knock code, then select Next.
   Note: Draw the pattern again to confirm.
   
5. Select the desired Lock screen notification, then select OK.
   Note: To change lock screen notifications, swipe down from the top of the screen, then select Settings icon > Sound & notification > Lock screen.
   
6. LOGIN USING SECURITY LOCK: Swipe in any direction across the lock screen then enter your knock code.
   
7. To adjust the screen lock time, from the home screen, select the Settings icon > scroll to and select Lock screen > Lock Timer > desired option.
   Note: 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 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.