Unicom card hd 1 card cannot find the closing option.

You can turn off the HD function in the phone settings.

First of all, you can open the phone settings, find the mobile data in the settings, find the call voice settings and drop them down. At the bottom, there is high-definition call function. When you click the button at the back to turn it off, you can see that the high-definition picture in the upper right corner of the phone is gone. That's it. The HD call has been turned off.