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Well, there is one big obstacle to 3G networks... Many communities (especially in the SF Bay Area) refuse to allow new cell towers to be installed. This is one of the reasons why Cingular's service out here is so pathetic (and since T-Mobile uses Cingular's network on the West Coast, their service is pathethic as well).
My wife uses a Sprint card for work. We live in the heart of Silicon Valley and Sprint's coverage is pretty lame out here.
So I don't see widespread 3G data networks being a viable solution in places where coverage is lacking.
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