Security researchers presenting at the Where 2.0 conference have revealed a hidden, secret iOS file that keeps a record of everywhere you've been. The record is synched to your PC and subsequently resynched to your other mobile devices. The file is not transmitted to Apple, but constitutes a substantial privacy breach if your PC or mobile device are lost or seized. The researchers, Alasdair Allan and Pete Warden, have released a free/open application called "iPhone Tracker" that allows you to retrieve the location data on your iOS device and examine it. They did not discover a comparable file on Android devices.