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

Amazing work, I would have bought one just for this if I lived in a city and not a suburb.

Well I will be installing this tomorrow.

So the hotspot needs a SIM card, right? Is the idea to use the SIM card in this and then connect to it from your phone?

I assume a paid cellular service plan for the hotspot is required for it to connect to a cell tower?