https://www.cnet.com/news/i-used-the-huawei-mate-x-and-now-im-a-foldable-phone-believer/

Huawei wants its turn in the foldable phone spotlight, and with the Mate X, it makes a convincing -- but expensive -- audition. The main competition: Samsung's Galaxy Fold phone, which has two screens, six cameras total and unfolds in the center to open into a 7.3-inch tablet. Huawei's Mate X -- that's pronounced "ex," not "ten" -- has three ways to use on 8-inch screen, four cameras (three you can see, one that's temporarily hidden) and an interesting design that gives you a grippable base for one-handed use. 

When closed, the Mate X bends one big screen backward into two sides, treating each of those sides as a "screen" that lights up as you turn and move the device. Flip it upside down, turn it around, open it up, and the phone knows exactly where you are. It worked well in my brief time with the Mate X, but the hardware design itself is novel.