[dmix]

This is being done with IMSI Catcher detector [1] using machine learning to learn which towers you commonly connect to, then warning you when:

a) a new cell tower ID has suddenly appeared at a specific lat/long when it wasn't there before

b) the encryption/protocol changes or gets degraded

[1] https://secupwn.github.io/Android-IMSI-Catcher-Detector/

[malandrew]

Furthermore, since these IMSI catchers are mounted on planes, can't they be detected by the fact that they are moving?