Also see Samsung's Folding Smartphone Concept Bends All the Rules | Wired
"Samsung isn’t the only phone maker working on foldable devices, though. Huawei reportedly plans to release a foldable handset next year. Lenovo and Xiaomi have also started teased their own prototypes, and LG is also working on flexible OLED displays and TVs that roll up into a box.This is Samsung’s foldable smartphone | The Verge
Microsoft is even working on a multiscreen device, which could be a modern take on the old Courier concept. Microsoft Surface chief Panos Panay previously revealed that a pocketable Surface device is “absolutely my baby.” Phone makers you’ve probably never heard of are also experimenting with tablet-like devices that fold into a phone form factor, so expect to see a lot more of these handsets in 2019."