I salivated over the 10k AAdvantage miles for switching to ATT as my Verizon contract was up AND they had the phone I wanted AND the phone was $100. cheaper AND their sales people sounded sharp, however...........based upon my experience with ATT residential service I knew in my heart of hearts that after the sale I would never find a human and I watched a guy in the office wait at least a week for his phone service to kick in on the number portability issue alone.
I do not know if Verizon is an option in your area, but I can tell you that I have been with them for 10 years and their customer service has been excellent. I would also note that I saw a Consumer Reports article some time back that indicated VZ had the best coverage in the U.S. and, based upon my map perusal just recently, that appears to remain true. If you end up with the sch i600 or i700 make note of my username as you will want to contact me to find out who to ask for at Level 2 support.