How to set the background picture of iPhone call?

How to set the background image of iPhone incoming calls:

1, first open the phone and click to enter the photo.

2. Select the photo you want to use as the background image. After selecting the photo, as shown in the figure, click the icon in the lower left corner.

3. Click on the contact icon in the lower right corner to assign it to a contact.

4. Click Select.

5. Click to select a contact.

6. This sets the background picture of the incoming call. As long as the selected contact calls, the screen just set will be displayed in the background.