Power Key
Press and hold to turn on or off Airplane mode ， enable silent
mode or silent mode with vibration，disable silent mode，power
off or restart the phone.
Press to turn off or on the screen display.
Home Key
Touch to return to the home screen.
Touch and hold to open Google Now.
Menu Key
Touch to view the options for the current screen.
Touch and hold to see recently used applications.
Back Key
Touch to go to the previous screen.
Volume Key
Press or hold to turn the volume up or down.
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