I realize this isn't quite the point of the article, but I have a $29.99 Nokia phone I've been using for years and I'm pretty sure I can resell it for at least $20. Non-smart phones hold their value best of all.
i've found that nokias sell well second hand. i wouldn't recommend an iphone second hand as they are much more fragile than old solid nokias. i've seen a number of iphones that the mic or wifi no longer works on and knowing the users i don't think they abused the devices that much.
http://www.itp.net/553344-hackers-pay-top-dollar-for-old-nok...
i've found that nokias sell well second hand. i wouldn't recommend an iphone second hand as they are much more fragile than old solid nokias. i've seen a number of iphones that the mic or wifi no longer works on and knowing the users i don't think they abused the devices that much.