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How to set the background picture of Xiaomi's mobile phone call?

Taking Xiaomi X9 mobile phone as an example, the specific operation includes the following steps:

First, open "Settings" on the phone desktop.

Second, open the "Settings", find the "System Application" column, and click enter.

3. Click "Telephone" in the "System Application" interface to enter.

4. Select "Advanced Settings" under "Telephone" and click "Enter".

5. Then select "Call Background" to proceed to the next step.

6. Finally, check "Lock screen wallpaper background" to complete the operation.