The EFF calls them cell-site simulators ... received power from a cell tower, and the data from the cell tower. This data was thrown at QGIS, an open source Geographic Information System package ...

Credit: EFF Rayhunter is an open source tool designed ... As it analyzes the traffic between itself and the cell tower to which it's connected, it looks for suspicious activity, like an attempt ...

As such, the Electronic Frontier Foundation (EFF) has developed an open-source tool called Rayhunter to help detect and understand the use of these devices. CSS operate by mimicking cell towers ...