I tried the OP Log Kit apk to add the VoLTE option in the Function Switch in *#800# menu and it works. Stock OP7Pro OOS 9.5.8
https://www.getdroidtips.com/how-to-enable-volte-and-vowifi-on-oneplus-7-pro/
Country: Chile
Carrier: Entel
Settings Used: OP LogKit App, Stock OOS 9.5.8
https://www.getdroidtips.com/how-to-enable-volte-and-vowifi-on-oneplus-7-pro/
Country: Chile
Carrier: Entel
Settings Used: OP LogKit App, Stock OOS 9.5.8
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