VoNR, or "Voice over 5G New Radio" is a basic call service that fully utilizes the SA architecture of 5G network.
All realme 5G models support VoNR.
You can follow the steps below to turn on the VoNR calls option.
1. Settings > About phone > Version > Click "Build Number" 7 times. If there is a lock screen password, you need to enter the lock screen password.
2. Settings > Additional settings > Developer options > Networking > turn on the VoNR calls option.