I would like to ask how to set the background for incoming calls?

How to change the call background on vivo mobile phone:

OriginOS 3, OriginOS Ocean system:

Enter the "Phone" APP--click the dot in the upper right corner? --Phone settings--Call background--Contact call background/Unknown number call background--select.

Note: When "Dark" is selected, the call background will be the blurred desktop wallpaper.

Other systems:

The call background displays the desktop wallpaper by default. If you need to change it, just change the desktop wallpaper.

Tips:

1. The call background uses a blurred display effect;

2. Set the "call background" on the call interface, which only supports storage. Setting the call background for contacts on the phone is not supported for contacts stored on the SIM card or unfamiliar numbers.