Opporeno4pro？ How to turn off HD?

1. The mobile phone should support "VoLTE HD calling" function.

2. China Telecom SIM card has opened VoLTE service.

3. The local China telecom operator VoLTE network coverage is normal.

On-off method of China Telecom SIM card "VoLTE HD call"

Version 1, ColorOS 12. 1 and above: You can set the status bar of Notification and Status Bar to turn on or off the display of "HD Call" (that is, the "HD" sign).

2. The following version of ColorOS 12. 1: Please refer to the following instructions.

(1) How to open "VoLTE HD Call".

A. The SIM card of China Telecom has been successfully opened and registered with the "VoLTE HD Call" function at its service operator.

B after the B.SIM card is inserted into the mobile phone, the mobile phone will turn on the "VoLTE switch" by default, and the "VoLTE switch" entrance will not be displayed; That is, the phone can't turn off the "VoLTE switch", and the status bar of the phone will display the "HD" sign.

(2) The closing method of "VoLTE HD Call".

If you need to cancel the "VoLTE HD Call" function without displaying the "HD" logo in the status bar of your mobile phone, please contact the customer service of China Telecom operator for handling.

Tips:

①“VoLTE HD Call function belongs to the business scope of operators (China Mobile, China Unicom and China Telecom). Please contact the operator's customer service to enable and cancel this function.

② After the operator enables and registers the "VoLTE HD Call" function, the words "HD" will be displayed in the status bar of the mobile phone after the "VoLTE HD Call" function is enabled on the mobile phone.