I had AT&T for the 1st few months at Scholl and really couldn't stand it. Reception was fine in the dorms (2nd floor) but in the West Pod (where most of 1st year classes are)... I'd MAYBE get reception for a little bit if I was lucky. And same goes for Rhodes Auditorium, the gym, and forget about getting anything down in the computer labs or where the cadaver lab is (not that too many people get reception down in the basement anyways).
It wasn't unbearable with ATT, but I eventually switched over to T-Mobile and am much happier with the service/reception. But reception probs also could have been related to the phone I had at the time (BB Pearl). For the most part, I've noticed Sprint has the best reception on campus out of all the carriers.