Currently, I am using a basic phone. I have not preordered the iPhone, but I am going to upgrade to the iPhone 5 once it is available to people who did not preorder. With my basic phone, I have the unlimited data plan for non smart phones from AT&T for $10/month. If and once I upgrade to the iPhone or any other smartphone, would I still be able to keep my unlimited data plan or will I have to give it up?