1. First of all, press and hold the Power button.
2.A Power Off option is available. Choose it and tap OK.
3. Halt for a couple of seconds.
4. Afterwards, press the Power button again to turn the phone back on.
1. Take the back cover off and the battery out for a short while.
2. After that short while, put the battery and the cover back in.
3. Lastly, turn on the phone by holding the Power button.