1. Press and hold the Power button.
2. Next, do choose the Power Off option. Tap OK.
3. Just wait for a couple seconds.
4. Now hold down the Power button again to turn the phone back on.
1. First, take off the back cover and remove the battery for a few moments.
2. Next, put the battery and the cover back in.
3. Last, turn the phone back on by holding the Power button.