What does it mean that the mobile phone displays HD? Where can I turn it off?

If you are using a vivo mobile phone, the status bar displays the HD logo, indicating that the mobile phone card has been successfully registered in the VoLTE network, HD 1 indicates that the card 1 is in the network, HD2 indicates that the card 2 is in the network, and HD 12 indicates that both mobile phone cards have been registered in the VoLTE network.

VoLTE (High Definition Voice Call) is an IMS-based voice service. All services are carried on 4G, and there is no need for 2G and 3G networks. VoLTE can provide high-speed data services and high-quality voice calls under the same network, that is, 4G network.

Features: fast connection speed, better call effect, and surfing the internet while talking.

VoLTE closing method:

You can go to mobile phone settings-mobile network/dual card and mobile network-SIM card information and settings, and turn off VoLTE HD calls;

Some models:

1. Go to Settings-Mobile Network/Dual Card and Mobile Network/Phone, and turn off the VoLTE call;

2. Go to Settings-More Settings-About Mobile Phone-SIM card status to turn off VoLTE calls.

3. Please contact the operator to turn off the VoLTE function of the SIM card.

Note: At present, when installing mobile, telecom and Unicom SIM cards on some models, the "VoLTE HD Call" option is hidden by default, and the VoLTE function is turned on by default, and no option is set. If you don't need to use this function, you can contact the operator to close the VoLTE service. If you want to experience the VoLTE function again, you can contact the operator to start the VoLTE service and resume using it.