1. SET UP A SECURE SCREEN LOCK: Swipe down from the Notification bar with two fingers, then select the Settings icon.
   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-select the center of the screen to wake up the screen. To lock the screen, double-select an empty area on the Home screen or the status bar in any screen (except on the camera viewfinder).
   
2. From the Display tab, select Lock screen. Select Select screen lock.
   
3. Select the desired screen lock type. Set your desired Knock code, then select NEXT.
   Note: For this demonstration, Knock Code was chosen. After selecting next, enter the desired knock code again, then select CONFIRM.
   
4. Select desired Lock screen notification setting.
   Note: To change lock screen notifications, swipe down from then Notification bar then select Settings icon > Sound & notification > Lock screen.
   
5. LOG IN USING THE SECURITY LOCK: Press the Power/Lock button located on the back of the device. Enter the Knock code.
   
6. ADJUST THE SCREEN LOCK TIME: Swipe down from the Notification bar with two fingers, then select the Settings icon.
   
7. From the Display tab, select Lock screen > scroll to and select Lock timer > select the desired option.
   Note: Visit att.com/deviceunlock to learn more about requesting a device unlock for your AT&T mobile device, so that it can operate on another compatible wireless network. 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.