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updated 12:19 PM EST 12.21.12
AT&T rolls out 4G LTE network to 15 markets, four expanded
AT&T has rolled out its 4G LTE network in 15 new markets in the United States, and expanded network coverage in a number of already-live locations. Ten have gone live today, while five others were launched earlier this week -- pushing the total overall number of markets AT&T's 4G LTE network is operational in to 124.