Hi, I've got an U.S. iPhone with AT&T as the carrier. Before visiting Canada, I added the 50 MB international data plan to the account. Used the phone while in Canada on Rogers' network. Back home now. I see the data usage has been posted to my account already and seems like that's all of it. So the question is: can I drop the plan now and then when I pay my bill in two weeks, I'll be charged at the plan rate? Or do I have to keep the plan activated until AFTER I pay this bill?