However, the customers crying loudest for this kind of arrangement are probably iPhone customers and unfortunately, they're not covered by the policy. According to the Consumerist, the policy requires post-paid customers to have completed a minimum of 90 days of active service. Pre-paid customers must provide a detailed receipt or other proof of purchase of the handset. Further, customers who own handsets for which AT&T has an exclusive sales arrangement with a manufacturer of less than 10 months will have to wait until the 10-month period expires before they can receive an unlocking code.
That sounds very reasonable, but because the AT&T/Apple sales agreement is more than 10 months (we may not know when it ends but it's been nearly three years to date), iPhone users are still pretty much stuck with AT&T.
Read more on the Consumerist.