If you are using AT&T as your ISP, then you probably need to stop downloading illegally unless you want to get caught. According to this post at TechCrunch, anybody using AT&T internet services had better stop downloading pirated music or movies:

AT&T is to begin working with the RIAA and MPAA in a concerted effort to track down and punish AT&T internet users who download pirated music and movies.

But you wouldn't be downloading illegally anyway, would you?