This little phenomenon has been going on ever since lines were wrapped around buildings as consumers waited impatiently for the iPhone 3G, but even now, original iPhones are fetching wild prices on the secondhand market. In a weird twist of economics, Apple's iPhone actually maintained the majority of its value even after its successor hit the market. Why, you ask? Put simply, first-gen iPhones purchased from eBay or other pre-owned resellers arrives sans an AT&T contract, and of course, it can be (relatively) easily unlocked to work with some other carrier. PSA: if you're still sitting on your old iPhone for no apparent reason, now would probably be an excellent time to test the market.