Getting to know your phone
Phone overview
Earpiece
Proximity Sensor
Use to take a picture of yourself or to video chat on supported applications.
Power/Lock Key
t Press and hold to power on and off, restart, enable and disable Airplane mode, or change the ringer type.
t Turns your screen on and off and locks it. 
Touch screen
Back Key 
t Returns to the previous screen.
t Closes
Menu Key 
t Displays available options for the current screen or app.
t Press and hold to view a list of the most recently used apps.
Home Key 
t Returns to the Home screen from any screen. t Press and hold to open Google Now.
NOTE: Proximity sensor
When receiving and making calls, the proximity sensor automatically turns the backlight off and locks the touch screen by sensing when the phone is near your ear. This extends battery life and prevents you from unintentionally activating the touch screen during calls.
Warning! Placing a heavy object on the phone or sitting on it can damage the LCD and touch screen functions. Do not cover the LCD proximity sensor with protective film. This could cause the sensor to malfunction.
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