How does Apple's mobile phone recover the deleted SMS content?

The steps to restore deleted SMS for iphone are as follows:

Step 1: Open iTunes software and connect your phone to your computer. After the connection is successful, click the small mobile phone icon in the upper left corner of the window, then select "This machine", click the "Back up now" button, and then click "Don't back up the application" in the pop-up window.

Step 2: Open the "PP Assistant" software and click "Toolbox" and "iTunes Backup Management" in the figure below.

Step 3: In the next window, you can see the file backed up by iTunes first, and we can double-click it.

Step 4: Click "SMS" on the left, then click to select "sms.db", and then click the "Export" button to export to your computer. Sms.db is the database file of mobile phone short messages of Apple mobile phone, and all received short messages and sent short messages are saved in this file.

Step 5: Open "Louyue SMS Recovery Software", click "File" and "Open SMS Database File", and then select the sms.db file just exported.

Step 6: At this time, all undeleted messages will be displayed on the software interface. At this point, you can click the file and restore the deleted SMS. After a while, the deleted SMS on Apple's mobile phone will be successfully recovered. You can click on the mobile phone numbers on the left in turn to view them.