We take our cell phones with us everywhere - which makes them the perfect tracking device. Just walking around with your device will give your location away in multiple ways. But even if you had no apps on your phone, the cellular chips in our devices will constantly be interacting with every cell tower that's in range, negotiating the best tower to talk to, whether to use 5G or something else, and authenticating to the network - even in Airplane Mode. Cell site simulators (aka Stingrays or IMSI catchers) can be used to trick your phone into give away your location. The Electronic Frontier Foundation (EFF) has developed a cheap, easy-to-setup device that can try to discover and report these devices. Today I interview an expert panel about the clever Rayhunter project: Cooper Quintin, The Gibson, and OopsBagel.



Interview Notes




Rayhunter announcement: https://www.eff.org/deeplinks/2025/03/meet-rayhunter-new-open-source-tool-eff-detect-cellular-spying 



EFF’s Rayhunter project: https://efforg.github.io/rayhunter/ 



Submitting logs to EFF: https://efforg.github.io/rayhunter/support-feedback-community.html 



DEF CON talk on Rayhunter: https://spectra.video/w/jt9rZHCU51Rh58cBD8oiP3 



Buy yourself an Orbic hotspot: https://www.ebay.com/sch/i.html?_nkw=orbic+rc400l 



Gotta Catch ‘Em All: https://www.eff.org/wp/gotta-catch-em-all-understanding-how-imsi-catchers-exploit-cell-networks 



iPhone/Android fake cell site protections: https://www.eff.org/deeplinks/2023/09/apple-and-google-are-introducing-new-ways-defeat-cell-site-simulators-it-enough 



Meshtastic: https://meshtastic.org/docs/getting-started/ 



Veilid: https://veilid.com/ 




Further Info




My book: https://fdsd.me/book 



My newsletter: https://fdsd.me/newsletter 



Support the mission: https://fdsd.me/support 



Give the gift of privacy and security: https://fdsd.me/coupons 




Table of Contents




0:00:00: Intro



0:02:26: Interview setup



0:06:18: How did you become in involved with Rayhunter?



0:12:08: What is a cell site simulator?



0:14:01: What does a CSS look like and how are they deployed?



0:16:55: How is a CSS used for surveillance?



0:20:31: Can cell site simulaters work with modern protocols like 5G?



0:24:09: What information can you sniff from the cellular network?



0:27:41: Is there any transparency around the use of CSS's?



0:30:02: How did Rayhunter evolve from previous work?



0:35:00: How do I make a Rayhunter device?



0:41:45: I've create a Rayhunter... now what?



0:46:10: How can I protect myself against CSS surveillance?



0:49:38: Does Airplane Mode really disable your cellular radio?



0:52:22: How else might I defeat mass surveillance tech?



0:54:46: What's next for everyone?



1:00:53: Interview wrap-up



1:03:36: Meshtastic



1:04:49: Patron podcast preview



1:05:26: Looking ahead