Ok so I have done a minimal amount of tethering using netshare and assumed that at&t wouldn't know. I mean I don't have massive amounts of data usage. I've used 279MB since I got it which was over a month ago. But when I look at my pageonce app which shows my at&t account it has a section for internet/MEdia pay-per-use which tells me that I have used 0.03MB and have a limit of 0MB. Does this mean bad things are happening? I don't see anything on there anymore about having unlimited data either. But then of course it also isn't currently showing my text messages, which it usually does... Any ideas?