Rog 6d ultimate VoLTE switch not visible to select under sim settings

[gtstoyboy]

Please tell us some basic information before asking for help: can use data but no calling
Model Name: rog 6d ultimate
Firmware Version:
Rooted or not: not
Frequency of Occurrence:always
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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