I'm no longer an AT&T user after switching to Verizon with the iPhone 5 but I'm curious if call quality has improved with the iPhone 5. I had the AT&T iPhone 5 for a little bit before switching and the LTE network was great - I could finally get emails or surf during business hours in midtown. However, I decided to switch to Verizon because voice calls aren't over LTE but continue to be carried over GSM, which still seem overloaded at peak hours in NYC/Manhattan despite years of AT&T upgrades. In the days before the iPhone 5 went on sale, I had a bunch of calls to my iPhone 4 that didn't ring or failed to show up as missed calls and voice mails that showed up hours after their time stamp. I figured AT&T LTE data network wouldn't solve these call-related problems but wanted to ask folks who had the phone longer what their experience has been. I will say during the brief time I had an AT&T iPhone 5, I didn't have those call issues except for one call which connected but the other person couldn't hear me; ironically, it was a call to AT&T customer service 
