Meet Rayhunter: A New Open Source Tool from EFF to Detect Cellular Spying

Rayhunter is a new open source tool we’ve created that runs off an affordable mobile hotspot that we hope empowers everyone, regardless of technical skill, to help search out cell-site simulators (CSS) around the world.

Electronic Frontier Foundation
@evacide not sure if I just missed it in the documentation, but do you need an active SIM card for this to work? I live Puerto Rico where Verizon doesn’t operate.
@georgeperez @evacide IIRC you do need a sim card but it doesn't have to actually be activated.