Remember when your parents told you that your life is worth more than whatever a thief wants to take from you? It seems some phone owners, tempted by GPS-tracking apps like Find My iPhone, are ignoring that advice and tracking down criminals themselves in hopes of getting their smartphones back. The New York Times has followed up with a few iPhone vigilantes, and as you might expect, not all cellphone recovery missions turn out so well. But there are also some incredible stories, including a man who posed as a woman on OKCupid to lure his thief out of hiding.