I don't know if this has or does happen to anyone else, but it's a bit annoying. Whenever I am talking on the phone to any of my friend's (non-iPhone users) everything is fine. However, when I'm on the phone with my girlfriend (iPhone user), I always have my voice echo on my end. She says she can't hear my echo on her end, so obviously I'm the only one hearing it. I find this a bit odd that it only happens when I talk to my gf. She just recently upgraded to an iPhone from her 2 year old LG flip phone. The echo didn't start immediately after she got it, but I have noticed to happen every time we've talked for the past two weeks. And never once did I have the voice echo issue when she had her LG phone. Maybe I'm completely wrong, but is this an AT&T thing? I wouldn't think it's an Apple problem, but like I said, I could be totally wrong. I'm probably going to stop by an AT&T store sometime this week and see what they say. But in the meantime, I wanted to see if this has happened to anyone else, and if there are any possible solutions for this?