For those of you readers who have been curious, here is the canonical list of carrier logos installed directly on the iPhone. I know we've bandied about a bunch of carrier names here at TUAW. And, yes, it's easy enough for Apple to change its mind as negotiations go on and just do a software update to add or change logos and/or carriers. Leaving all that aside, at this time, the built-in carriers appear to be Cingular/AT&T, T-Mobile, and Vodafone. Each logo appears in two files in /System/Library/CoreServices/SpringBoard.app, as Default_CARRIER and also FSO_CARRIER using a non-standard png encoding.