How to use volte function for Unicom card?

The calling party can realize the video call by selecting "Video Call" in the dialing interface.

VOLTE (High Definition Voice Service) can only be used normally if the following conditions are met:

1. There is already a mobile phone that supports VOLTE. (Whether VOLTE service is supported or not is subject to the contents of the terminal manual)

2. Apply to China Mobile to open the program-controlled functions of VoLTE service, including SMS, business hall, online/handheld business hall, etc. SMS activation mode is to send KTVOLTE to 10086, and SMS cancellation instruction is to send QXVOLTE to 10086. The VoLTE service function depends on the internet access function of the mobile phone, and the VoLTE program control function can only be activated after the internet access function of the mobile phone is activated. 3. Enable the VoLTE function in the phone settings. 4. After completing the above steps, the mobile phone can be restarted. In the 4G network environment, the words "HD" or "VOLTE" will appear in the column of user's mobile phone model, indicating that the VOLTE service has been successfully launched. Note: the above words will not appear after the VOLTE function is turned on on Apple's mobile phone. 5. Call VOLTE voice phone: You can make normal calls. In the VOLTE network environment, voice calls will be automatically carried in the data network, and you can surf the Internet normally during the call, and the data network will remain uninterrupted. 6. Calling VOLTE videophone: On the premise that both the caller and the called party use the VOLTE function, the caller can select "Video Call" in the dialing interface to realize video call.