We've been hearing whispers, rumours, and leaks about Samsung's foldable smartphone plans for years now. Years. And now it's finally real.

Samsung unveiled its foldable smartphone prototype at its Developers Conference in early November, showcasing a handset that offers a big, bold display when fully opened up, yet also has a smaller screen on the outside for one-handed use.

It's experimental and seemingly strange, but so was Samsung's Galaxy Note Edge – and now curved displays are here to stay. Will foldable screens be the next big, innovative wave? We'll find out when the handset ships sometime in 2019, but here's everything you need to know for now.