[Namidairo]

> One day he asked me to create a program that rooted a specific type of flagship Android phone and to update the carrier information to his choosing.

Are you referring to the baked in default APN's for different MCC/MNC combinations? Yeah those were/are quite annoying to have around if they were out of date. (I think there might be auto-update of these now, but that obviously requires a network connection)

Or are you referring to actual radio config partitions on the flash? (Where one was able in the past on many models, flip bits in order to activate different cell bands)

The former being janky and security risk, the latter being somewhat illegal.

[lcw]

This is from about 10 years ago. So the carrier apis were a little different then, but the answer is both were necessary to update depending on the test or in this case carrier.