Huawei P20 User Guide - Page 31
VoLTE, VoLTE: Make Calls and Use Data at the Same Time, Enable VoLTE to Enjoy HD Calls
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Dialing 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. l Dual 4G: Both of your Phone's SIM card slots support 4G. l Dual VoLTE: Both of your Phone's SIM card slots support VoLTE, allowing you to use the Internet while making HD calls. l Dual VoWiFi: Both of your Phone's SIM card slots support VoWiFi, which allows calls to be made 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 l Some carriers may not support this feature. l 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 carrier network), you can: l Enable 4G: Turn on 4G. Due to carrier customization, there may not be a 4G switch on your device. This indicates 4G is already enabled and does not need to be turned on manually. l Enable VoLTE calling: Turn on VoLTE HD calls. l Enable Wi-Fi calling: Turn on Wi-Fi calling. After the setting is complete, select the contact you want to call and touch to make a video call. You can also touch on the screen during a voice call to switch to a video call. 27