OPPO A54 , WiFi Calling setting features How to use - YouTube
FIND X3 PRO - VoWIFI disponible chez FreeMobile - Entraide - OPPO Community
Comment activer les Appels Wi-Fi sur votre mobile Oppo ? - Assistance Orange
OPPO - You can now make calls over Wi-Fi with the VoWiFi feature on OPPO Smartphones. Many people get frustrated by making calls in areas with poor mobile reception and are daunted
Oppo F11 and F11 Pro are receiving the VoWiFi (WiFi calling) support with April 2020 security patch