"Find My iPhone"?

I lost my iPhone Yesterday at a friends Gathering, My friend reminded me that I could use the "Find my IPhone App" to locate my phone , Unfortunately it was switched off at that time . The next morning,She called me to tell me she had a location for my iPhone and drove straight there with the Police and actually got my iPhone just in time before it could be sold by the person who stole it. I Am being happy that I got my iPhone back thanks to "Find my IPhone" It really did help me so much ,Without it I wouldn't have found it.?????????????