Rear Camera
Micro Sim 
microSD
Power key
Volume up Volume down
Recent Apps key
•Touch it to open a list of thumbnail images of applications you've worked with recently.
Home key
•While on any application or screen, touch to return to the Home screen.
Back key
•Touch to go back to the previous screen, or to close a dialog box, options menu, the notification panel, etc.
These keys are visible when the screen lights up.
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