I bought a (now JB) Iphone 4 on eBay. I took the micro-sim (with original Unlimited Data Plan active), out of my Ipad and put it in my new Iphone. (I DON'T need phone calls, ONLY data). Here's my question: If I run MyWi 4.0 to tether my Iphone to my Ipad when I need it, will AT&T know? Will they care?