How does realme open vonr?

Open the settings, click the phone, click the version information, then return to the settings and find the developer option.

VoNR refers to the voice service directly carried end-to-end by 5G network. In this way, in order to ensure the continuity of voice calls and support the switching between VoNR and VoLTE, the system will decide whether the voice needs to be switched to 4G or 5G according to the measurement report reported by the UE.