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The iPhone 5S, left, and iPhone 5c are displayed, Sept. 17, 2013, in New York. As telecom companies rev up the newest generation of mobile service, called 5G, they’re shutting down old networks — a costly, years-in-the-works process that’s now prompting calls for a delay because a lot of products out there still rely on the old standard, 3G. AT&T in mid-February is the first to shut down the 3G network, which first launched in the U.S. just after the turn of the millennium. AT&T says a delay in retiring the network will hurt its service quality. (AP Photo/Mark Lennihan, file)

The iPhone 5S, left, and iPhone 5c are displayed, Sept. 17, 2013, in New York. As telecom companies rev up the newest generation of mobile service, called 5G, they’re shutting down old networks — a costly, years-in-the-works process that’s now prompting calls for a delay because a lot of products out there still rely on the old standard, 3G. AT&T in mid-February is the first to shut down the 3G network, which first launched in the U.S. just after the turn of the millennium. AT&T says a delay in retiring the network will hurt its service quality. (AP Photo/Mark Lennihan, file)

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