5G is back in the news, now that the new iPhones are hitting shelves. They're not the first devices to have the tech – not by a long shot – but Apple being Apple, they're likely to be the first owned by normal people. (Competitors such as Samsung have, by and large, brought out specific 5G versions of their latest devices, as a way of hedging their bets: you don't want to cram expensive chips, and huge batteries, in a device if its owner is just going to throw a 4G SIM card in it.)

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