There have been interesting talks on GSM on the Chaos Communication Congresses: http://events.ccc.de/congress/2008/Fahrplan/events/3007.en.html http://events.c

There have been interesting talks on GSM on the Chaos Communication Congresses: http://events.ccc.de/congress/2008/Fahrplan/events/3007.en.html http://events.ccc.de/congress/2008/Fahrplan/events/3007.en.h... -> Recordings on http://events.ccc.de/congress/2008/wiki/Conference_Recordings/index.html http://events.ccc.de/congress/2008/wiki/Conference_Recording... http://events.ccc.de/congress/2009/Fahrplan/events/3535.en.html http://events.ccc.de/congress/2009/Fahrplan/events/3535.en.h... http://events.ccc.de/congress/2009/Fahrplan/events/3654.en.html http://events.ccc.de/congress/2009/Fahrplan/events/3654.en.h...