When you send your phone to an authorized Samsung service center, technicians use proprietary software that communicates with com.sec.facatfunction to re-calibrate sensors after a screen replacement or motherboard repair.
Activate Powerful Hidden Menu on All Samsung Galaxy Smartphones!
Have you recently run any or updated your software?
It may be involved in the hidden "Factory Mode" or diagnostic menus ( *#0*# ) that Samsung technicians use to test components like sensors, cameras, and microphones before a phone leaves the factory.
adb logcat | grep -i facat
