AT&T is terrible
I have Verizon and ATT due to having to keep my old number and a new business where I don't want to cross numbers. After using ATT, I can truly say the service is so bad I am almost ready to dump it.
For those that say Apple products never have issues -- that is completely wrong. I have had to reset my iPhone because it was unable to get to the internet, applications just go back to the main page after you try to run them, etc.
I do like the iPhone but it would be so much better on Verizon.