How Foldable Phones Like Samsung’s Work—and How You’ll Use Them

This week, not one but two companies introduced phones that fold. Not clamshell devices like the classic Motorola Razr, or a hinged, two-screen curiosity like the instantly forgotten ZTE Axon M. These new phones—the unnamed concept Samsung showed off, and China’s Royole FlexPai—have screens that bend like a sheet of paper. Foldable smartphones have been …

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