Our Canadian friend, Chris24 points us to the the fine print on the AT&T/ iPhone service agreement which states that it costs "Charges for international messages sent from the U.S. are 20¢ for Text Messages and 50¢ for Picture/Video Messages.".
Oh REALLY? We didn't know the iPhone had picture and video text messages. Heck, legit (unhacked) iPhones can't even do video as far as anyone outside of Cupertino knows.
This might be a typo on AT&T's part - some sloppy cutting and pasting perhaps. Check up the full screen here.
However, Boingbo