Okay...I have no idea if this is complete coincidence but I have to state what I am seeing. San Francisco has had POOR (and that is putting it mildly) AT&T Voice reception. Notice is say voice reception. I can use the data services all the time but even on full bars on 3G I am damned if I can sometimes make a call. This is because, so I have been told, is that voice takes channels and if all the channels are being used you are screwed. Also, it didn't help that AT&T's "upgrade" to the system didn't work and they had to install the old equipment back in. Regardless, 99% of the time entering the city, not during rush hour mind you, I would get dropped right after going through the Treasure Island tunnel and then once again on the off ramp to Fremont Street and Folsom. However, since the launch of iPhone on Verizon I have made it from Treasure Island to the inner part of the city three times now without a disconnect. Of course, I am very happy with that and almost don't care why. But I thought I would post my findings.