The FlexPai by the start-up Royole can be thought of as the first flexible phone. This achievement has been rewarded by a Design Award from Red Dot. The company has also won a second such prize for another of its products: a flexible, portable keyboard.
https://www.notebookcheck.net/The-Royole-FlexPai-wins-a-2019-Red-Dot-Design-Award.415371.0.html