Huawei Mate20 User Manual page 114

2
Touch the text under
OK.
When the prompt is displayed, touch Settings to access the SIM management screen.
Enable Data Roaming
Once you have activated the international roaming service, you can enable this feature to use
mobile data when traveling abroad.
This feature requires the support of your carrier. For details, contact your carrier.
•
Charges may apply when using the international roaming service. For details about
•
how data roaming fees are charged, contact your carrier.
Go to Settings > Mobile network > Mobile data, and enable Data roaming.
If your phone has two SIM cards installed, configure the settings for SIM 1 and SIM 2
respectively.
Use VoLTE to Make HD Video Calls
VoLTE (Voice over LTE) is an IP-based data transmission technology. After enabling VoLTE, it
can provide you with fast call connection times and high-quality voice and video calls.
Enable VoLTE
1
Contact your carrier to activate the VoLTE service for your SIM card. If both the primary
and secondary SIM card trays of a dual-SIM phone support VoLTE, it can be enabled for
both SIM cards.
2
If two SIM cards have been inserted, go to Settings > Mobile network > Mobile data. In
the network settings area for SIM 1 or SIM 2, enable VoLTE calls.
This feature may vary depending on your carrier.
•
5G services are 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 touch
Manage Data Usage
Open Optimizer, then touch Data usage to view data usage and manage network access.
until a prompt is displayed, then select a SIM card and touch
to switch to a video call.
Settings
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