The phones are still locked, however, which means they will still work only on AT&T’s network. Apple used to require an AT&T contract for its phones, even for the ones being purchased without a contract subsidy.
The FAQ included in the memo specifically states, “Q: Do you have to be an AT&T customer to purchase an iPhone at full price? A: No. Any customer can purchase one device only full price iPhone.”
Apple offers its 8GB iPhone 3G for US$499, the 16GB iPhone 3GS for $599, and the 32GB iPhone 3GS for $699. Customers are limited to one such purchase per day.