I can't believe this. AT&T is one of the worst "companies" I have ever seen. I live in a suburb very close to Chicago, and we still can't even get 3G. This is confirmed from my own observations and by asking several people who use their service around here. That is totally unacceptable. You would think they would invest in some tower upgrades in one the largest metro areas in the entire world, but I guess this is AT&T we are talking about. It is also hard to even make regular voice calls. Calls are frequently dropped and even if they don't drop they sound terrible. Additionally I find it humorous that AT&T actually wants people to pay to get an Internet relay device. Why should I pay from my own pocket to fix their coverage issues. Isn't that what the monthly changes for service are for?*
Correction. You are having issues and problems because the coverage for ATT in your area is bad. No so for most around the country, as the study found.
I travel frequently weekly in fact and have not had one dropped call on ATT. Get 6Mps speeds frequently all around the country. ATT has been great for me.
Any carrier will give better or worse speeds and coverage based on where you are. All things being equal with the same coverage in the same area ATT will give you better speeds, the best speeds, Verizon the least amount of dropped calls, and Sprint slow speeds and the most dropped calls according to the study.