Currently my iPhone 4 is with AT&T and they aren't bad in my area. I'm grandfathered in the unlimited data plan and really want to keep it, plus I like roll over minutes. I also really like being able to use data and voice simultaneously however, Verizon has better service coverage overall. So I'm not sure if I should stick with AT&T or go to Verizon when I upgrade to the iPhone 5. Any suggestions?