My 6-year old son has inherited our old iPhone 3G. I'm looking for an app that we could use to track the phone should it (or he!) go missing! I was hoping there would be an app to ping it's location. I don't have MobileMe so the Find My iPhone app won't work. I understand there would be some privacy concerns with an app like this, but if you were to sign in on both phones (similiar to the way home sharing works) it would probably be ok!