I have a 3g, and so does a friend. Occasionally, either will make a call to someone, and whenever we're not talking, the remote party hears very noisy static. This happens whether the remote party is iPhone or not. Once we talk or a noise is made, the static goes away and the voice is clearly transmitted, and then the static starts again. The signal strength is good and the voice is clear -- it's just the off-mode static that's horrible. It's as though the microphone muting (or whatever you want to call it) between segments of talk is not muting, but actually adding static/noise. Often, hanging-up and calling again will fix it. I've only ever experienced this issue with the iPhone, but it's also my first time with AT&T. So, I'm wondering if anyone else experiences this same behavior and if they've had it on other phones or not?