On the prepay comments.... And not to say my comments are correct, accurate, far off, far out....
With prepay, I believe you can order something for a month, and then let it go. A few days later, you scrape up enough change, buy another card, and watch for another 30 days. I image it will be in 30 days increments. But also wonder if you could buy AT60 on the first, then buy another package on the 15th, and each would run 30 days.
No commitment subscriptions.... I believe you could stop and start with each start billed in monthly intervals, but I think there is a charge to start back up, where prepay shouldn't have it.
Annual subscriptions.... Currently not available on all packages.
Cell phones not popular with prepay! Ask those 3 dudes arrested for buying a 1000 of them. Plus there were some others who bought many phones. And its the choice communications package for those involved in illegal activities, and minors can get them also.