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AT&T begins cannibalizing its 2G and 3G networks to boost LTE

Verizon, Sprint and T-Mobile are all turbo-charging their 4G networks, but ATT won’t be left out of the party. It’s begun building a new LTE network in the PCS band, the swath of digital communications spectrum where carriers have traditionally run their 2G voice and 3G data services.

ATT PCS LTE screenshotGigaom’s favorite mobile signal spotter Milan Milanovic spied ATT’s new network in his NYC stomping grounds last week (Milanovic caught the first glimpse of Verizon’s massive new LTE network in NYC as well). As Milanovic’s screenshot shows, ATT has a 5 MHz-by-5 MHz network running in the 1900 MHz PCS band — band 2 is PCS — which previously contained only HSPA and GSM signals. Commercial devices are already connecting to the network.

ATT actually revealed its plans to cannibalize — or as they say in industry speak, refarm —

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