yeah, i got an unlocked cingular phone (nokia 6230) and I'm using my AT&T
SIM. It worked as soon as I put the
SIM in, but I had to call to get the web settings.
Since you have an AT&T
SIM and you are getting a AT&T phone, you will not have a single problem...Just remember to store your contacts to your
SIM so you don't have to transfer them all over