GSM Spy Finder is described as 'Simple and reliable program to detect activity of GSM Monitoring System equipment designed for active and passive interception of voice and data of any GSM networks' and is an app in the Security & Privacy category. There are seven alternatives to GSM Spy Finder for Android. The best alternative is Android IMSI-Catcher Detector, which is both free and Open Source. Other great apps like GSM Spy Finder are SnoopSnitch (Free, Open Source), GSMmap (Free, Open Source), Netmonitor (Freemium) and Cell Spy Catcher (Anti Spy) (Free).
Monitor GSM/CDMA/LTE network: current and neighboring cell infos, signal strength. Multi SIM support (when possible). Use GPS/geolocation. Generate database with custom info on cells. Export log to file CLF/KML. Map shows cell location. List WiFi access points.