1. To turn on, press and hold the Power/Lock key until the screen lights up.
   
2. To turn off, press and hold the Power/Lock key.
   Note: If the screen immediately goes dark, you did not hold the Power/Lock key long enough. Unlock your phone, and then try again.
   
3. Tap Power off.
   
4. If you are unable to turn your phone on, plug the phone into a power source, and then try again.