Salam
Some how jazz has registered me on VoLTE users and now my phone (Note 9 Korean varient flashed to F rom) is connected to VoLTE. I have not contacted jazz or dm on twitter.
Few findings:
Sim if inserted in S10 5G having default korean rom is not registering on volte. Despite entering...
First of all are u on PAK csc?
Check it using Phoneinfo app in csc code section.
Secondly use a file browser then go to root/system/omc then copy the relevent csc folder.