Surveillance Detection for Android Phones
It’s called SnoopSnitch:
SnoopSnitch is an app for Android devices that analyses your mobile radio traffic to tell if someone is listening in on your phone conversations or tracking your location. Unlike standard antivirus apps, which are designed to combat software intrusions or steal personal info, SnoopSnitch picks up on things like fake mobile base stations or SS7 exploits. As such, it’s probably ideally suited to evading surveillance from local government agencies.
The app was written by German outfit Security Research Labs, and is available for free on the Play Store. Unfortunately, you’ll need a rooted Android device running a Qualcomm chipset to take advantage.
Download it here.