https://www.cnet.com/news/using-the-mate-x-made-me-a-foldable-phone-believer/

Foldable phones are shaking up the industry with a daring design that effectively doubles the amount of screen space you have to use on your phone while still making the device small enough to carry around. Because foldable phones are phone-tablet hybrids, they can command a higher price, which opens up an important revenue stream at the top end for companies looking to make a greater profit in a slowing market. 

But this new era of bendable screens also represents the Wild West of phone design: A phone could fold inward or outward, down the center or on two sides, or even bend back around your wrist like a watch. At this early stage, companies are working out what a foldable phone means. Right now, anything goes.