Motorola has been granted a patent for a foldable smartphone that unfolds into a tablet. While it is not the first patent for a foldable smartphone that has surfaced in recent times, it is the first to show how a foldable smartphone could work with a smart case design to give it even more potential usage scenarios.
https://www.notebookcheck.net/Motorola-patents-a-foldable-smartphone-tablet-concept-with-clever-integrated-cover.303070.0.html