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Plane tickets, loyalty cards, and more have moved from wallets to cell phones. But one key document has not: the passport. Unless you’re in Finland. In August, it began the world’s first digital-passport program, for Finnish citizens flying on the national carrier, Finnair, between Finland and London; Manchester, England; or Edinburgh. To qualify to use the app, people must register with their local police, have their photograph taken, and sign a consent form. But once onboarded, all travelers have to do is get their phones scanned at airport immigration, and the fear of losing their one paper passport is gone.

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