To turn on the phone, press and hold the Power/Lock key on the back side of the phone for 3 seconds. To turn off phone, press the Power/Lock key on the back side of the phone for 3 seconds and tap Power off and Power Off to confirm.
Note: Placing a heavy object on the phone or sitting on it can damage its LCD and touch screen functionalities. Do not cover the LCD's proximity sensor with a protective film. This can cause the sensor to malfunction.