Nisam ni znao, ima več neko vrijeme, kažu TETRA je crackirana:
https://www.youtube.com/watch?v=Fy3Odm-dny0
https://www.youtube.com/watch?v=tm_b1vUfrbU
https://www.tetraburst.com/
https://www.blackhat.com/us-23/briefings/schedule/#redacted-telecom-talk-31807