I have an iPhone, but I did not connect it to AT&T. Instead, I use Skype. Sure it does not work everywhere, but just about anywhere these days has someplace nearby with free wifi, so I can make any calls, check messages, email, etc.

I would NEVER pay for a cell phone, seems like a total waste of money to me. So, a smart phone with Skype was a great solution for someone like me who does not like to talk on the phone, but likes having a number where people can call and leave messages, then I can decide who to call back and when.