The good thing about apps that can help you to find a stolen smartphone: you can find your smartphone. The bad thing about apps that can help you find a stolen smartphone: you can find your smartphone - a fact which makes police worried GPS sleuthing could go very wrong for anyone inclined to play Sherlock Holmes. Below for the points of concern:
(New York Times, May 3, 2014)
Comment: I get that the police may sometimes be slow in their response to a personally "traumatic" event like a stolen smartphone. However, on any given day there may be bigger fish to fry, and eventually law enforcement will do what it can to recover stolen property, particularly if that property has a known good location. Don't even think twice about this one - a search that could lead you to something much bigger and badder than just a thief with a stolen smartphone - isn't very smart!