ok, here is my understanding. AT&T and Cingular have started sharing the GSM network down in So. Cal. AT&T was also supposed to switch to teh GSM network in June of 2002 up here in northern cal. for some reason unknown to me, this hasn't happened yet. But that said, AT&T, VS, and Cingular will all be sharing the same networks throughout california. I have to say, Cingular has gotten better in the past year, when they first came out with the U/L NW, their network was so overloaded that it was crap, but it ahs gotten a lot better. But with the addition of VS and ATT to the networks, even if they do expand their network and both ATT and VS create their own towers, that still means taht service, atleast for a while, is going to suck for everyone.
but then, it's still probably worth it. i won't be switching naytime soon as a TDMA ATT customer on contract for 2 years, but for 3000 Peak + unlimited weekends for 49.99, if i had a choice i would. i mean, a current att customer gets 600 peak and 3500/UL NW, for 49.99, if you aren't using all 600, that leaves u with 2400+ NIGHT minutes, plus unlimited weekend minutes, it still works out to about the same, for those of us that make many calls in the day, this is killer.