Volte; Use Vowi-Fi For A New Calling Experience - Huawei P20 User Manual

VoLTE

VoLTE: Make Calls and Use Data at the Same Time
VoLTE (Voice over LTE) allows both call and data services to be carried on the same 4G network, which
means you can use the Internet even while making calls. VoLTE also provides you with shorter call
connection times and higher quality voice and video calls.
Both of your Phone's SIM card slots support 4G, VoLTE, and VoWiFi, so there is no need to switch
SIMs back and forth.
Dual 4G: Both of your Phone's SIM card slots support 4G.
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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
Only dual-SIM phones support both SIM card slots enabling 4G, VoLTE, and VoWiFi.
Open Settings, and go to Wireless & networks > Mobile network. In the settings section for
SIM 1 or 2 (if supported by your network provider network), you can:
Enable 4G: Turn on 4G. Due to network provider customisation, there may not be a 4G switch on
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your 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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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 Phone network reception.
This feature must be supported by your carrier. Contact your carrier for more information,
including fees and charges.
Open Dialler, go to
follow the onscreen instructions to set the preferred network.
> Settings > Wi-Fi calling, enable Wi-Fi calling. Touch Mode and
Dialling
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