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Samsung Patents a Foldable Phone with A Rotating Camera
 
The patent shows that it will consist of two housings connected by a hinge. The rotating camera module will be placed either at the top right corner or dead center in the right bezel.

​Moreover, folding angle and motion sensors are also present. They will help with determining the phone’s orientation and the angle at which the two housings are. The rotating module will then act according to the sensors’ signals while the camera app is open.
 

​This design allows the manufacturer to spend fewer resources on a front-facing camera system resulting in a lower production cost.