How to turn off the high definition displayed in the notification bar of mobile phone?

First of all, let me introduce what this HD is. HD is China Mobile's VoLTE HD calling service. This display is displayed in the notification bar of your mobile phone, which proves that this function is turned on on the mobile phone.

If you want to turn it off, click Settings in your phone.

After entering the settings, click wireless and network, and each mobile phone may be different.

Then click on the mobile network, and everyone can find the mobile network on their mobile phones.

After entering the mobile network, cancel the VoLTE HD call.

After cancellation, you will find that there is no high-definition sign in the notice bar above.