Zte avid plus - Installing the Nano-SIM Card and the Battery

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Key
Function
Recent apps key
Touch to see recently used apps.
Back key
Touch to go to the previous screen.
Volume key
Press or hold either end to turn the volume up or down.
Installing the Nano-SIM Card and the Battery
Switch off your phone before installing or replacing the battery or the Nano-SIM
card.
1. Place your finger in the slot at the bottom of the back cover to
lift and remove the cover.