AT&T, formerly Cingular. It could be because I used outdated signals during the time. My old Blackberry used GPRS which didn't even work at my train station (which is underground downtown Chicago) and many other places. My new Blackberry I was issued 2 weeks ago uses EDGE and that works great just about anywhere so far. I haven't tested it in airports yet.
I'm flying to Long Island March 19th, so I'll test it then.
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