Are there any requirements for using the VOLTE service?

You must meet the following three aspects to use the VoLTE high-definition phone service:

1. The mobile phone terminal supports VoLTE;

2. Make sure that VoLTE has been activated. You can edit the text message "DGVOLTE" to 10010 to activate;

3. Under the "Mobile Network" item on the mobile phone settings interface, enable VoLTE high-definition calls.