Okay, let's say that a month has passed, the iPhone 5S is already on sale, and you missed the best time to sell your iPhone 5. Maybe you’ve decided you need another option. Family and/or friends are usually willing to negotiate a decent price for gadgets, plus it is probably less of a risk than Craigslist.
No one willing to buy? Time to have a little fun. You could jailbreak your phone in order to use third-party apps, connect it to a RedEye mini to make it into a TV remote control, channel your inner Thomas Edison (left) and connect it to a phonograph to enjoy some tunes, or create a data-collecting rocket (because why not). The Internet is full of inspiration.
Level of ease: However easy or difficult you would like (though the data-collecting rocket is going to be on the tougher side).
Estimated trade-in value: That is up to you and your loved ones, or your crafting ambition.