Now, I don’t have a mobile me account (yet) so I can’t test it, but from what it would seem with Apple’s Find iPhone app that it helps you find your missing iPhone. The error (if I am correct) would be that if you have lost it, you can’t use an app on it to find it as you don’t know where it is. If it is a multitasking background app, than that’s not as mad, but it worked fine without it anyway. Does Apple think that people are so rich they have one iPhone that they lose and another that they use to find it? Seemingly pointless.