T-Mobile's version of the iPhone 5 has the same model number (A1428) as the one sold by AT&T, yet has unique tweaks that make it compatible with T-Mobile's WCDMA/HSPA+ network in the 1700 MHz AWS band. Unlocked A1428 iPhone 5s sold by AT&T and Apple will be able to work with T-Mobile's LTE 1700 and WCDMA/HSPA+ 1900 networks with a minor software update, but will never work with T-Mobile's WCDMA/HSPA+ 1700 network, according to an Apple product manager at today's T-Mobile event. That means only iPhone 5s sold by T-Mobile will have full high-speed data coverage from day one. Unlocked iPhone 5s used with T-Mobile will have limited high-speed data coverage at first, improving as T-Mobile makes progress with its network modernization this year.
Source phone scoop
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