To turn the phone on, press and hold the Power/Lock key until the screen lights up.
To turn the phone off, press and hold the Power/Lock key.
Tap Power off.
Tap POWER OFF.
If you are unable to turn your phone on, plug the phone into a power source for 15 minutes, then try again.
If you are unable to turn your device off with the Power/Lock key, remove and re-insert the battery. Note:This performs a simulated battery disconnect.