The reverse side of a cellphone or smartphone with a round camera on the corner. 

Phone Or Tablet Facing Back

A front-facing tablet or large phone with an empty screen.

Tablet

A phone case with camera hole or the back of a cellphone.

A girl sitting on the floor and holding a tablet or phone.

A tilted mobile device with a camera, such as a smartphone or tablet, facing back.

A tilted smartphone or tablet with a round camera lens on its the corner, facing back.

A tablet or smartphone with a camera, seen from the back.

The back of a tablet, propped up on a stand.

A smartphone or tablet with a centered camera lens, facing back.