AT&T has decided that unlimited data is no longer something that they want to offer to new customers, and on June 7th, it goes away for good. Now, if you area already on the $30 per month unlimited data plan, you are certainly able to keep it, provided you never move away from it. Once you change your data plan, you can never go back to unlimited. How’s that for a means to lock in current iPhone customers? Continue on for a detailed look at the new AT&T data rate plans.