Foldable phones, step back: Here comes a phone that expands on demand

Phones that you can fold and unfold like a book? Ugh, that’s so 2019… At least, that’s what Oppo, the biggest smartphone maker in China, would say. BBC were recently able to get their hands on some of the first working models of this phone (after its development was publicly announced a few months ago), and released a video to show how it works. 

You swipe the power button, and the seemingly regular device magically expands from 6.7 inches all the way to a 7.4-inch tablet. (You swipe the power button down, or simply squeeze the phone to make it return to normal.) Oppo …
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