Sounds like they may know by having a mole in this Forum!There are ways to get around AT&T's retarded system. There are tons of posts on another hacking iPhone forum, where people are getting away with the tethering issue everyday. While I don't use enough data via the MyWi app for AT&T to detect anything, others do and are getting away with it everyday, so don't sit here and spout off your AT&T system garbage, because I assure you, ANY system has a work around, including AT&T's.
Signed,
Anonymous!