In the fallout of the most recent privacy scandal (The Canadian Privacy Law Blog: NSA collection of info on ordinary Americans wider than originally suspected), Verizon and Bellsouth are denying having given calling information to the National Security Agency in the first place. (See: NPR : Phone Companies Distance Themselves from NSA.) Another major carrier, Qwest, got some publicity for first saying they were asked by the NSA but refused. (See: Qwest Goes From the Goat to the Hero - New York Times.) There's nothing I can find in a quick search of the conventional media or in the blogosphere suggesting that AT&T have issued any statements one way or another.