What does hd2 mean?

What does hd2 mean? What does the phone display hd2 mean and how to turn it off?

1. hd2 means that we have launched China Mobile’s VoLTE high-definition voice service.

2. If we want to turn it off, we need to click to open the phone's settings and click "Phone" in the settings.

3. On the "Phone" page, we can see the words "Turn on volte". Click to turn off the switch behind it to complete.

4. In this way we will remove the "hd2" mark.

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