Wifi Calling, also known as VoIP, works by connecting to the internet through a WiFi network, which enables you to make cellular calls or send text messages from the device without having to use a cellular network. Does your Xiaomi 12 pro support this feature?
Xiaomi 12 Pro Support WiFi Calling
The Xiaomi 12 Pro now supports Wi-Fi calling or VoWiFi following recent MIUI releases.
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