If you just want to see the current MCC/MNC values, you can:
-
dial
*#*#INFO#*#*(with SIM/eSIM enabled and connected to network), and scroll all the way down, -
or install the
Networkapp from F-Droid, which is just a shortcut to*#*#INFO#*#*, -
or probably use
adb shellto find the file that has the setting. (I haven’t actually done this myself, so I’m not sure of the actual location in the file system.)
I imagine the MCC/MNC codes are simply populated (somewhere) in the system, based on the network identity from the SIM/eSIM, so it may not be necessary for the user to enter them manually.
Still… It seems stupid if they’ve now been removed from Android APN settings.