Use Vowi-Fi For A New Calling Experience - Huawei Mate20 Pro User Manual

Dual VoWiFi: Both of your Phone's SIM card slots support VoWiFi, which allows calls to be made
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using Wi-Fi. You can use VoWiFi to make calls even in Airplane mode.
Some carriers may not support this feature.
Enable VoLTE to Enjoy HD Calls
Some carriers may not support this feature.
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Only dual-SIM phones support both SIM card slots enabling 4G, VoLTE, and VoWiFi.
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Open Settings, and go to Wireless & networks > Mobile network. In the settings section for
SIM 1 or 2 (if supported by your carrier network), you can:
Enable 4G: Turn on 4G. Due to carrier customization, there may not be a 4G switch on your
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device. This indicates 4G is already enabled and does not need to be turned on manually.
Enable VoLTE calling: Turn on VoLTE calls.
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Enable Wi-Fi calling: Turn on Wi-Fi calling.
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After the setting is complete, select the contact you want to call and touch
You can also touch

Use VoWi-Fi for a New Calling Experience

You can use VoWi-Fi to make voice and video calls in any location that has a Wi-Fi network, even
when there is no mobile network reception.
This feature must be supported by your carrier. Contact your carrier for more information,
including fees and charges.
Open Dialer, go to
follow the onscreen instructions to set the preferred network.
on the screen during a voice call to switch to a video call.
> Settings > Wi-Fi calling, enable Wi-Fi calling. Touch Mode and
Dialing
to make a video call.
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