Hate to see you leave but yet I understand . Phone comes first, IF you cannot get service when you really NEED it what's the use in having a Titanuim Coated Stealth Iphone !!!!!. In your case I would go as far as saying even IF Apple did everything on your wish list THEY still cannot FIX AT&T's crappy GSM low frequency transmission codec mess.
I do wish you the best, please visit us here often and lend us your cranium when needed.
IF you wanted to switch to VZW I have a Treo 700P and a MotoQ Black in perfect condition

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Funny it worked.....the last time!!Now I am not sure what was working before they put a hole in my head!!!!