AT&T is the only company that gets reception where I work. I usually get 2-3 bars in the buildings I work. People on other services like Verizon or Sprint barely get 1 bar, if that.
My parents have AT&T for their landline service, but have had serious problems with it. I don't know what plan they had before, but my mom would call her sister who lived abroad for a while. When she moved back to the states, my parents wanted a cheaper plan. Just something where they can call US numbers and Canada since my dad's sister lives there. I forget the exact sequence of events, but their bill went down a bit, then higher than it originally was, and at some point, my service was added to theirs, even though I'm on a separate account. AT&T seems so incompetent.