1. While the device is off, press and hold the End/Power key to turn on.
   
2. While the device is on, press and hold the End/Power key to turn off.
   
3. If you are unable to turn your phone on, plug the phone into a power source for 15 minutes, and then try again.
   
4. If you are unable to turn your phone off with the Power/Lock key, remove and re-insert the battery.