How to open volte HD call with telecom card?

Send "ktVoLTE" code to 1000 1 by SMS, then reply "y", and then turn on the VoLTE function in the phone settings.

VoLTE is a high-speed wireless communication standard for mobile phones and data terminals.

Based on the IP Multimedia Subsystem (IMS) network, it uses special configuration files (defined by GSM Association in PRD IR.92) for the control plane and media plane of voice service in LTE, which enables voice service (control plane and media plane) to be transmitted as a data stream in the LTE data bearer network without maintaining and relying on the traditional circuit-switched voice network.

Extended data:

Advantages of opening VoLTE HD calls:

1. The voice becomes clear. VoLTE technology is based on data network, so it can carry more information than previous voice lines. VoLTE's voice and audio can reach the call quality of high-definition voice sampled at 16kHz, and the highest voice can reach full high-definition voice sampled at 20Hz-20kHz.

2. The telephone dialing time is shortened. In addition, under VoLTE, the dialing time of mobile phone is obviously shortened. After dialing the input number, it only takes about two seconds to connect (meaning to hear the beep or bell), while it takes 5-6 seconds or even longer for non-VoLTE (the system and hardware will also have an impact).

You can also talk on your mobile phone while surfing the Internet. VoLTE network can carry out data and call at the same time, which may not be obvious to Unicom users who use WCDMA network, but users of China Mobile could not do it before. For example, if you are playing a mobile online game, a phone call may cause the game to be disconnected, and VoLTE can solve this problem.

References:

Baidu encyclopedia-VOLTE