The Samsung Galaxy A80 was a phone in which a sliding mechanism was integrated so that its main cameras could flip around to the front as needed. Recent leaks have pointed to a 2021 successor for this innovative device, even if it might be a South Korea exclusive called the Quantum 2. This device may have emerged in new live images that may confirm the swivel-cam is not making a comeback after all.
https://www.notebookcheck.net/Alleged-live-images-of-the-Samsung-Galaxy-Quantum-2-or-A82-show-a-disappointing-lack-of-swivel.531373.0.html