search the forum under "cell phones." There's a whole thread about what cell phone services are good at what schools. It won't show up on the first page tho...flip through the first few pages. from what i remember, i don't remember hearing anything good about t-mobile.
well, i went to school in philadelphia, and will be continuing to go there. i haven't had any trouble with t-mobile, and neither have any of my friends who have t-mobile. reception and clarity are fine . . . i think sprint is preferred just because it gives lots of minutes, but one of my roommates had it, and didn't think it was too hot.