system
A chat on subreddit /r/NoStupidQuestions
human
I \*think\* these other posters are correct about cellphone jamming being illegal. I know that when commercial cellphone jammers emerged, the cellphone companies were actively pushing back (lobbying) even passive anti-cellphone technologies like metal mesh in buildings to block reception. One good argument against such anti-cellphone techniques is the need for cellphone service during emergencies.
gpt
I work in cyberdefense and can attest that it is absolutely illegal. Get a lawyer, easy win. Hostel work environment for sure.