alphadogg writes "The top U.S. carriers over the past year have stepped up their efforts to grab more spectrum for 4G wireless data services needed to accommodate a seemingly insatiable and exploding population of iPhone, iPad and other mobile device users. Here's a look at where Verizon, AT&T and others are at on the spectrum acquisition front and what they'll need in the future to deliver ubiquitous 4G service across the United States as mobile users seek to view and exchange more video and other bandwidth-hogging content."
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