hello VoLTE does not work in Russia
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This might be worth a try.
This is for all OP phones, however it discuses the 8 Series, but it should apply to any series as the protocols are the same.
[GUIDE] Enable VoLTE & VoWiFi on all devices NO ROOT.
Log Kit 1.0
There are newer versions but I would suggest trying this with the details provided on XDA.
If you do try the suggestions. Let us know how you get on.
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OnePlus 9 Series Creative Wallpaper Contest
by Adam Krisko, 2021-04-16