An IMSI-catcher is an eavesdropping device used for intercepting mobile phone traffic and tracking movement of mobile phone users.
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A list of known IMSI Catchers. User submissions welcome.
Wikipedia – Stingray
How surveillance destroys privacy
What is the Electronic Communications Privacy Act?
How Cell Towers Work
IMSI Catchers: Practical Knowledge for Activists
Spy vs Spy Goes Mobile
Practical Cellphone Spying
Cell Site Simulators
Karsten Nohl: Mobile self-defense
SS7: Locate. Track. Manipulate.