Boygeniusreport published a copy of document supposed to be for AT&T internal use only.
If the information described in the text is true, AT&T customers might soon be able to purchase an iPhone 3G model 8 GB (599 USD) or 16 GB (699 USD) without being bundled to any subscription plan. To limit the development of a grey market around such SIM-unlocked iPhone models, sales will only be allowed to AT&T customers.