The 4G quad play is coming later this summer when Comcast Corp. launches a WiMAX MVNO on Clearwire Corp.’s network in Portland, Ore. It plans to be in 80 markets with WiMAX by 2010.When Sprint-Nextel Corp. spun off its WiMAX operations last fall to create a new mobile WiMAX company, part of the synergistic deal was a series of overlaying ... (187 words)

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