Will he take out the sim card, shut it down and then sell it, or he uses it for himself? The story is that someone stole my iphone4 and I called my provider to block the iphone. I have also set find my iphone, but i cannot locate my iphone 4 now. Of course I file a report to the police but i have have little hope. I wonder i shouldn't have blocked my iphone 4 through the provider so that i could locate it with 3g. How does "find my iphone" work? Does it use only GPS or GPS+internet?