Foldable-display phones are slowly becoming more prevalent; however, they are still at a point at which they can only do so in one way per device: inward or outward. However, a new leaked video suggests a concept device that can bend in both directions is out there now. This possible breakthrough in the technology has allegedly been achieved by the panel-maker BOE.
https://www.notebookcheck.net/BOE-has-developed-an-ambi-folding-mobile-device-display-new-leak.525582.0.html