GameStop sure is on top of its game these days. Not only does the company -- which has made a name for itself as a reseller of used videogames -- accept trade-ins on a litany of devices ranging from BlackBerry smartphones to Android tablets, but it will even offer a hefty sum for your nonexistent iPhone 5S. As you can see by the screenshot above, GameStop has added the not-yet-official next-gen Apple smartphone to its list of accepted devices, complete with its own trade-in values.
So how much is an unreleased phone worth these days (or, more accurately, how much will the iPhone 5S be worth once it's actually available to purchase)? Let's compare the iPhone 5S trade-in values with that of the iPhone 5:
