During vacation, my boy left his iPhone on the seat of a Burger King in small New Mexico town. It was not until the next morning that we noticed it was missing. Thinking it surely was still around our hotel room, we launched Find My iPhone; but to our great dismay, the iPhone was located a few miles away, nowhere near us or the Burger King. We jumped in the truck and tracked the phone down to an old apartment complex. Find My iPhone pinpointed the location to within a few feet, so we knew it was in either a certain upstairs or downstairs apartment. We knocked on doors with no luck. So the next question was, do we tip our hand by turning on the alert function, or do we just wait it out. We decided on the former, so I sent the signal to the iPhone. We could faintly hear the phone, and finally tracked it to the upstairs apartment. I knocked, but no answer, and then finally resorted to saying "Hello?!" through an open window. Two gals emerged from the back of the apartment, and I politely asked for our iPhone back. At first they denied, but I sent the alert again, and all doubt was dismissed and they handed it over. So, MobileMe has paid for itself, but needless to say, I never want to go through that again!