Buy International devices. ATT does not have every IMEI of every phone in the world in their data base/ I use and International Note and the wife and International SGS II BOTH IMEIS were given to ATT. Both devices show up as clam shell phones. Both devices have UL MediaNet data bit are NOT REQUIRED to have ANY data,,

That is the best solution. Plus the International devices are not ful of carrier bloat and get updates a lot soonner as they don;t have to go through ATT's processes for each update. In our case we use custom ROMS which get updates even sooner than Samsung releases. We are on 4.04 and JB is already in preview mode on some phones.