said by en102
:They have a botched 3G network in many places.
Eg. Southern California, they have deployed 1/4 of their spectrum for 3G services on 1900MHz (while 850MHz would do a better coverage job).
This resulted in many seeing low signal (3G iPhone) and many dropped calls on 3G devices (how much voice + data can you push over a single 5MHz carrier in an area like Los Angeles?).
Well why should that be a surprise? I was a customer when Cingular (now AT&T) rolled out the 850 band in LA and it was an utter disaster. Constant dropped calls, calls that were misrouted and calls that went silent on one end. Th Long Beach area was so bad I was able to terminate my contract early and go to the carrier ranked number two in this survey, T-Mobile. I love them, the service is excellent. Why Apple didn't choose them for the iPhone is beyond me