On 2012.06.18 13.29, Parker Higgins wrote: > On 6/18/12 8:36 AM, Yosem Companys wrote: >> Hi Liberationtech folks, is this always the case? I've heard cases >> where people can still be tracked whether they have batteries in >> their cell phones or not... > > I've spoken with mobile security researchers who have given me the > impression that this theory hasn't been tested very much. It's > theoretically possible that some phones could be recording or > transmitting without the main battery, but the equipment that would be > required to test is prohibitively expensive and you'd have a hard time > demonstrating anything but an evidence of absence.
Unless there's a specific secondary battery powering a transmitter, it is improbable in the extreme that an unpowered passive device can have its location tracked at a distance of more than, say, a hundred meters, and any tracking at all is extremely unlikely. Cellphones don't work that way, and physics says no, basically. Now, *people* are very easy to tail, when you have a human doing the work. That's a different story. There are almost certainly many more pressing issues to worry about when it comes to locational privacy than a battery-less phone. E. -- Ideas are my favorite toys.
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