Logic dictates that smartphone screens can’t bend, right? Except they can. The newest sensation to hit these all-important devices is foldable screens. Last week Samsung got the jump on its competitors by announcing its Galaxy Fold before the annual Mobile World Congress. As the industry gathered in Barcelona this week, Huawei announced its own foldable, the Mate X, the day before the main conference began on Monday. Long-rumoured and frequently leaked, these new handsets are a technological marvel with bendable screens that cynics might call a solution for a problem that doesn’t exist. They might recall curved-screen televisions, which were similarly amazing technology that never solved any pressing problem and were more hype than substance. But these new phones certainly are tech wonders. The Samsung folds into itself, with an outside hinge, and looks not unlike those Nokia Communicators — but with a bright 4.6-inch screen on the outside — and opens into a 7.3-inch tablet. The Hua...

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