`MetroPC is the First US Wireless Service Provider to allow other carriers’ devices

MetroPCS Communications Inc. has become the largest U.S. wireless carrier to say it will let customers bring cell phones from other carriers, which it will then reprogram for use on its own network. This week’s announcement by the Dallas-based regional carrier is one of a series of moves in the industry that amount to a gradual opening of the U.S. wireless market, giving consumers more choice over what phones to use on what networks.

MetroPCS’s move threatens these traditional rules. It allows customers with certain models of phones from Sprint Nextel Corp., Verizon Wireless, Alltel Corp. and a few other carriers to bring their phones to MetroPCS stores, where they will be reprogrammed. Phones from AT&T Inc., T-Mobile USA or other providers that use a technology known as Global System for Mobile, or GSM, won’t work on MetroPCS’s network. It is already possible to bring an unlocked GSM phone from, say, T-Mobile, and have it activated on AT&T’s network, but AT&T won’t unlock the phone for you.

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