The credit card AT&T had for my iPad declined the charge when my unlimited data plan was about to expire (24 hours prior to date). I changed the card information but the unlimited option is no longer available. Here's what I found out from AT&T. - credit card will be charged 24 hours before the plan expires. - If card was declined, I will have to manually select a plan after current plan expires. - Unlimited plan will not terminate unless I change it or cancel the auto renewal. - changes to credit card info will not terminate unlimited plan. - I have 7 days after unlimited plan expired to renew it. After that, I will have to pick a new plan. Hope this helps.