Okay i need help with this one, I have a 3G ipad and placed my iphone 4 sim card and it worked (after a few config settings). Now AT&T emailed me saying it detected a sim card in the ipad and suggests to add a rate plan. What do I do?! If I continue using it will I get added an additional plan ontop of my iphone data plan? Can I ignore these emails & continue swapping sim card? Will my sim get deactivated? Will AT&T bust me? Help?