Im a longtime iPhone and AT&T user. I've experienced tons of problems with AT&T. Many times I cursed the network, other times I thought it was the crappy Infineon Cell chips the iPhones were using. Since getting the 4S, I must say my reception problems have vanished. The combination of the dual antennas and the super awesome Qualcomm cell chip are locking that signal down. I used to drop calls whenever in my parking garage. Now I have 2 bars and steady calls inside that underground garage. I also went from about 1.5mbps on speed tests to 5.78mbps. Overall I have to say the 4S is the best PHONE I’ve had on AT&T. Seems like the best of all worlds now, super speedy network and great signal. P.S. Ping times have been super low as well. Used to be 500-600ms, now its like 110ms.