t-mobile! i almost switched to verizon, because that's the co everyone in my family has (including my husband) but they were the same price with LESS minutes and i never go over..so i stayed with tmobile.
verizon. it was the only major cell phone provider that worked in the boonies of VA when I was in school. i've never been unhappy with it.
i have a razr and it's been pretty good to me. i've had the same one for about a year and i like it well enough. i think i'm going to get a blackberry next time, though.
TMobile and havent had any issues to date. I had issues w/most of the other providers, but that was way back when the cell phone boom started 8-9 yrs ago. Eventually with all the mergers Im afraid I may be stuck w/one of those again in the future.