How to completely delete SMS and call records?

Taking Xiaomi 9 mobile phone as an example, the deletion method is as follows:

Step 1: Open the SMS icon on the mobile phone desktop.

Step 2: All received messages appear in the list, and long press any message.

Step 3: Pop up the menu, select the operation to check, and select "Multiple Selection".

Step 4: A check box appears behind the information, select the information to be deleted, and click Delete.

Step 5: A dialog box pops up, asking if you want to perform this operation.

Step 6: After selecting Delete, the page information will be completely deleted.