Problem: Stingray devices pretend to be real cell towers. When your phone connects to one, Stingray can spy on your location and sometimes your calls or texts. Solution: Rayhunter helps spot when that’s happening. How it does it: 1. You run Rayhunter on a cheap little 4G hotspot (about $20). 2. The hotspot normally talks to real cell towers. Rayhunter watches the control signals in that traffic (not your browsing or personal data). 3. If the “cell tower” starts doing suspicious things — like for