Just recently, my dad bought an unlocked 4gb iPhone from his friend. Well I have a Moto Q on AT&T and I don't use internet at all on it because it is very expensive. I put my sim card that was originally on the Moto Q and I put it in the iPhone. I was just wondering if I use the internet on the Iphone, will the company charge me for using the internet on it? I am really confused because I don not want my family to pay an extra $30 for the phone bill...