So I successfully sold my white 16gb 3GS over the weekend for $350 (and $42 of free apps, plus universal dock, and original accessories), and am now looking into selling my contract since it still has the iPhone unlimited data plan, which I no longer need. I'm just going to go prepaid and pay like $5 a month since I never use minutes... Any idea how much these are worth? I signed up in Feb or March. Or are people just giving these away since they are already saving so much with no cancellation fee? I've got one person on my local craigslist that's looking for this plan, but I don't know what price to tell them or just free..