has anyone ever used the find my iphone with mobile me? how did it turn out? with one of my friends losing their iphone recently, it's made me think what all i need to do to make sure i can find my phone should that happen to me. I have mobile me and the find my iphone works, but are there any other precautions that you guys are taking? sometimes it's location is pretty broad and not much of a help. also- if someone swaps SIM cards (which is the case with my friend) does the find my iphone feature still work?