How to set up high-definition voice calls?

If you use vivo mobile phone, VoLTE is based on 4G network, and through IP transmission technology, operators can realize the unified bearing of data services, voice calls, video calls and SMS/MMS services. Under the VoLTE network, the voice call quality is better and clearer, the call waiting time is shorter (the connection time is as short as 3 seconds), and you can surf the Internet while talking, and the data network will not be disconnected. The daily use of the VoLTE function will make the communication experience better.

The VoLTE can be opened as follows:

At present, the system turns on the VoLTE HD calling function by default, and there is no setting option. Just contact the operator to start the VoLTE service and use it under the coverage of VoLTE network. The contact numbers of the four major domestic operators are: 10099 (China Radio and Television), 10086 (China Mobile),10 (China Unicom) and 10000 (China Telecom), so you can call them in time.

Funtouch OS 9 and above, enter Settings-Mobile Network/Dual Card and Mobile Network-Mobile/Unicom/Telecom-VoLTE HD Voice Call. If this option is not available, it will be turned on by default.

Funtouch OS 9 has the following system startup methods:

Path 1: Go to Settings-More Settings-About Mobile Phone Status-SIM Card, just open "VoLTE Call";

Path 2: Enter Settings-Telephone and turn on "VoLTE Call".

Note: If there is no VoLTE switch in the settings, you can go to this link page to consult online customer service for details.