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[liberationtech] Cell phone tracking

Steve Weis steveweis at
Fri May 24 14:49:33 PDT 2013

Regarding wifi-only phones, Euclid Analytics
(, has developed router add-on
software that can track consumers' mobile devices by MAC addresses.
The routers send that data back to Euclid for aggregation.

There are other companies working on similar ideas. I think the MAC
tracking component would be pretty straightforward to develop on your
own with an open router.

Even if you locked down the MAC address, there's ongoing research
about both mobile device physical fingerprinting and side channel
attacks via RF power analysis. I'd idly speculate you could
fingerprint a phone by some unique physical properties measurable via

On Fri, May 24, 2013 at 2:19 PM, Seth David Schoen <schoen at> wrote:
> I'm curious whether people in some countries have had success using
> wifi-only phones, including to make and receive calls by VoIP.  There
> are ways that wifi can be more private in some ways in some situations
> compared to the GSM network, but it's also much, much less ubiquitous.

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