There was an article awhile back about how MetroPCS used microcells to offload traffic in high-use, small areas.
Also, 20 MHz of spectrum (which T-Mobile has in places) is enough to push out a DOCSIS 1.1 channel worth of bandwidth over wireless. Put enough cell sites so that you're serving about as many customers as the cableco does and you'll have no problem giving everyone the bandwidth they want.
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