I'm not exaggerating when I say about 75% of my calls are dropped on the AT&T network. That has gone up significantly since the addition of SMS photo texting. We have a rule among AT&T users that who ever initiated the call calls back when the call is dropped. That way we are not continuing to call each other back getting voice mail when the call has dropped.

When I first made the rule people laughed but now think it is a good idea because it happens so much. I even tell people on lan lines or other networks because I know the call will drop on my end. I love my iPhone but I often think of leaving due to the poor service.

I'm in the San Francisco area and calls in peak times 5-6pm drop about 95% of the time after a minute or so.