It seems that this one is still a little difficult for some folks. Like me, you probably have been pressing on the Speaker/Camera cover on the back of the device to get the cover off however, that is not how it is supposed to be done and after time, could actually dent/damage the cover for the Speaker/Camera.

Removing the back cover
Remove the back cover to access the battery compartment, SIM card slot, and storage card slot.

1. Hold the device securely.
2. Pull the device’s front panel from the gap on the top panel as shown.

Replacing the back cover
1. Insert the tabs inside the back cover into the holes on the bottom panel of the phone
2. Press the phone against the back cover until it clicks into place.
The two prongs underneath the back cover act as the antenna for your phone. You must install the back cover properly for the antenna to function.