What does it mean when hd1 is displayed in the upper left corner of the phone?

#HD1 is displayed at the top of the mobile phone screen, indicating that the SIM card has enabled China Mobile VoLTE high-definition voice service. If you need to cancel, go to Settings-(More Connection Settings)-Mobile Network-HD Voice-Turn off.

Warm reminder: VoLTE is Voice over LTE. It is an IP data transmission technology that does not require a 2G/3G network. All services are carried on the 4G network, and data and voice services can be implemented on the same network. unity under. In other words, 4G networks not only provide high-speed data services, but also provide high-quality audio and video calls, and the latter requires VoLTE technology.

HD Voice is a new voice service launched by China Mobile’s 4G brand, which can bring a clearer and better communication experience. When a phone call comes while the mobile phone is surfing the Internet, the Internet speed will be greatly reduced to 2G or 3G or even disconnected. However, HD voice can maintain the 4G network during the call without attenuation of the network speed. No disconnection.

HD voice core technology:

HD voice uses VoLTE as the core technology. It is an IP data transmission technology. All services are carried on the 4G network, which can realize data and voice services in the same Unification under the Internet. In other words, the 4G network not only provides high-speed data services, but also provides high-quality audio and video calls. The latter requires VoLTE technology to achieve.

HD voice will also greatly improve the clarity and smoothness of the call screen in video calls, and can effectively solve the frame freeze, stuttering and blurry video call experience.

This article comes from the FAQ column.

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