No, it's not AT&T. My old Razr outperforms both the iPhone I (wife's) and iPhone II (son's) in terms of being able to make or receive a call with a weak-signal

No, it's not AT&T. My old Razr outperforms both the iPhone I (wife's) and iPhone II (son's) in terms of being able to make or receive a call with a weak-signal. I simply suspect the transceiver is not as sensitive (don't know about iPhone III, however).