I don't know if it has improved or not, but my wife and I both had smart phones(She had an iPhone, and I had couple of different phones, so hardware wasn't the issue) under AT&T plans and the number of dropped calls was simply incredible. My wife asked the same question when we were discussing it, and I pointed out that with AT&T, "talk and surf" was more like "drop calls while you surf". We switched to Verizon when the iPhone became available there, and honestly, I don't think there's been a single issue with dropped calls or needing to talk and surf at the same time. I'll sacrifice some multitasking ability for more reliable phone service. And I got an LTE phone for myself, so I didn't actually sacrifice the multitasking part personally
