1. To power on, press and hold the Power/Lock key.
   
2. To turn the device off, press and hold the Power/Lock key.
   
3. Tap Yes.
   
4. If you are unable to turn your phone on, plug the phone into a power source, and then try again.
   Note: See 'Phone assembly' for details.
   
5. If you are unable to turn your phone off with the Power key, remove and re-insert the battery.
   Note: See 'Phone assembly' for details.