The Electronic Frontier Foundation (EFF) has created Rayhunter, a $20 device that helps people detect if police are using fake cell towers to spy on their phones. The device uses a simple ...

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 ...