+1 on that. Besides, if you use AT&T you're already getting spied upon, right?
*thinks*
Hmm, if I routed a Google Voice call through to my brother's AT&T'powered Tracfone, the spies could really be confused, right? Since the personal information trail is shaky on both GV and Tracfone. Oh wait, I have auto-refill on Tracfone and paid storage on Google (PicasaWeb FTW). Back to the drawing board.