Huawei Mate 50 Pro User Manual page 32

Dual VoLTE: Both of your Phone's SIM card slots support VoLTE, allowing you to use the Internet
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while making HD calls.
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 HD 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 on the screen during a voice call to switch to a video call.
Dialing
to make a video call.
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