Drawings in a patent filing made by ZTE have been turned into renders by LetsGoDigital. The device in the renders can be described as a foldable smartphone utilizing a clamshell form factor. The ZTE smartphone folds over itself and leaves an exposed portion of the display. It looks oddly reminiscent of a Game Boy Advance SP handheld game console.
https://www.notebookcheck.net/Renders-for-ZTE-foldable-clamshell-smartphone-are-strangely-reminiscent-of-the-Game-Boy-Advance-SP.413584.0.html