Cingular is at&t and SBC is also now at&t. So SBC is now also Cingular. Hehe. If a=b and b=c then a=c.
SBC bought out AT&T but changed the name to at&t because the SBC name had gotten a bad rap due to past poor customer service and also because the at&t name was more widely known. Since the new at&t also wanted to get into the mobile market they then bought out Cingular. This now makes SBC Yahoo DSL now at&t DSL (not sure if they are still Yahoo or what relation at&t has to Yahoo!) and makes Cingular at&t even though they have not officially changed the name. But my billing for both has changed to 1 bill under the name at&t. This now makes at&t one of the biggest telecommunications companies in the world and poised to make the other companies shake in their boots.
I have a brother in law that works for SBC or the new at&t. Notice the new lower case letters. The folks at SBC got a kick out of this I guess.
You should be able to find a Cingular store in Champaign quite easily. Either go to the mall or Sam's club (requires membership) and talk to the people at the kiosk's or go to a Cingular store. The one thing Cingular has over all other cell phone companies is roll-over minutes. No other company can mimic roll-overs because Cingular not only invented it, they also patented and copyrighted it.