So, say you bought the iPhone 3G sometime in the last year and a new one comes out this June or July, technically you should not be eligible for the subsidy price. What does AT&T do about this? They introduce their new Phone Trade-In program of course. This may be one way AT&T will try to calm the angry hordes of people who feel they are owed the lower price. Keep in mind this is not without strings attached.
via The iPhone Blog.