Yesterday morning, I receive a call on my iPhone. I answer and they can't hear me. I hang up thinking it's a bad connection and dial them back. Same thing happens. I can hear them just fine, but they can't hear me. 1. I do the hard reset. 2. I do a full restore. Same problem. The only thing the other person can hear is a little bit of digital noise, like a swirly sound. 3. I call AppleCare and we go through the list of potential fixes. Nothing works. They send me to the Apple Store. At the Apple Store, the Genius Bar guy knows the problem before I even finish describing it. He says, "I've seen this problem nine times today, so I am thinking it's an AT&T issue. But just to narrow down the problem, let's replace your hardware." He replaces the phone with a new one and it works fine. So I go home and it works the rest of the day. This morning, I get to the office and the same problem is happening again. I know there are others on this forum who have experienced the same problem. But if it is happening to everyone at the same time, would it be an AT&T problem or an Apple problem? If it's an Apple problem, replacing the phone should have worked. But if it's an AT&T problem, it should happen across the board, and not to just nine people that day. That Genius Bar guy would have been bombarded with angry iPhone owners. Does anyone have any helpful insight on this problem (saying "AT&T sucks" isn't helpful insight) UPDATE: (January 7, 2009, 9:30am) I am on hold with Apple Tech support and they are trying to find a solution. As an experiment, we tried turning 3G off and it worked. Obviously, not a long-term solution, but effective for getting a call to go through. Any other input? I will update this thread if I receive a helpful fix from Apple or AT&T. These threads aren't any help unless there is a solution posted.