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NBC just reported that AT&T was urging people to use text messages to avoid congestion on their network. So, it's probably a capacity issue.

I live in Boston. Mobile service is running.

You can locally jam cell phone frequencies without involving the operators--seems like that'd be default bomb squad kit. I was along the racetrack at mile 23 and signal and data were extremely poor starting 10-15 minutes after the event--The local cells of the network could also have been simply overloaded.