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Carriers used to control everything, and now the tables have utterly turned

apps could reach across to nearby users for information, rather than push the phone’s circuitry to its limits by grabbing GPS coordinates and parsing data from the Web.

Smartphone apps could, for instance, recognize when a doctor is in the building, and alert him if another person nearby had dialed 911.

This idea, labeled “the third cloud” by David P. Reed of MIT, underscores the most profound change for smartphones currently coming to the market — namely, that they need not communicate with the carrier at all.

“Carriers used to control everything, and now the tables have utterly turned,” Dr. Lippman said. “That’s what’ll make the future so interesting.”

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