[1] https://cellularprivacy.github.io/Android-IMSI-Catcher-Detector/
[2] https://github.com/CellularPrivacy/Android-IMSI-Catcher-Detector/issues/151
NB: Android-IMSI-Catcher has been removed from F-Droid and Aptoide for some reason.
Rule of thumb for cellular phones: they are not your computer at the end pf the day. Between manufacturer collusion with Telcos, and legally mandated collusion between Telcos & Government, your phone exposes a small enclave of purported privacy that no one will attempt to look at (until they do); the rest of the system is essentially shared in management between user installed applications and stuff done in the background by the service provider.