My iPhone was working great on the 3g network up until about 3-4 days ago. Now it seems that when I am making an outgoing call my phone will call the number that I am dialing but it will not ring on my end nor connect to the caller on my end. The person I am calling however will receive a call without hearing anyone on my end. This is occurring over half the time now. I have been to the Apple store and traded out my iPhone, but the problem still exists. I'm in St. Louis, does anyone else have this problem?