What does it mean to have an hd on every call record? Can you remove this icon?

The display of HD on the mobile phone terminal usually means that the phone number has enabled the VoLTE function, and the mobile phone terminal supports the VoLTE function. For Unicom customers, you can edit the short message TDVOLTE and send it to 100 10 to turn off the VOLTE function. For mobile terminals, please refer to the mobile phone function and system interface.