Huawei P40 User Manual page 156

Enable VoLTE
1
Contact your mobile carrier to activate the 4G and VoLTE functions for your SIM card. If
both the primary and secondary SIM card trays of a dual-SIM phone support 4G and
VoLTE, 4G and VoLTE can be enabled for both SIM cards.
2
Go to Settings > Mobile network > Mobile data. In the network settings area of SIM
1 or SIM 2, turn on the VoLTE calls switch.
This feature may vary depending on your carrier.
•
The 4G network is used as an example here. If your device supports 5G, the operations
•
are the same.
5G is only available in some countries and regions.
•
Make a Video Call
Video calls are only possible when both parties are using VoLTE-activated devices.
1
Open Phone, touch the Contacts tab at the bottom of the screen, then select the
contact you want to call.
2
Touch to make a video call.
During a voice call, you can also touch
Manage Data Usage
Open Optimizer, then touch Data usage to view data usage and manage network
access.
to switch to a video call.
Settings
152