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Currently Being ModeratedApr 28, 2013 9:30 PM (in response to bryonwilliams)
Everyone with ios 5 or later has find my iphone on their iphone.
Find my iphone is a built in feature that you have to set up from the iphone itself. If you did not set it up then you cannot track your iphone.
The app is not needed at all and has nothing to do with locating the iphone on which it is installed.