Huawei Y7 2019 User Guide - Page 26
Enable VoLTE to Enjoy HD Calls, Dual VoWiFi, Settings, Wireless & networks, Mobile network
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Dialling 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 network provider), you can: l Enable 4G: Turn on 4G. Due to carrier customisation, 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 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. 22