Wipe your iPhone before selling it, because if you don't you might get your data stolen
Make sure you remove all your personal information before you sell or trade your #iPhone in because if you don't, the consequences can be creepy and dangerous as one Ontario teenager discovered. AppleInsider recounts the tale, and shows you how to avoid the same fate.
There are those of us who hang on to our old iPhones and build up a stash of them for no reason that we can quite justify. More often, though, we can see our outdated devices as being cash to put towards a new phone. When even a broken iPhone is worth something in trade, you have to be tempted.
You should do it, too. Not only could you save some money but you're getting someone the opportunity to own a cheaper, used iPhone. Just don't give them anything else by accident.