Why can't Apple's SMS be restored after being deleted?

Open the iTunes software (which can be downloaded from Baidu search), and then connect the mobile phone to the computer. Wait a few seconds. After the mobile phone is successfully connected to the computer, click the small icon of the mobile phone in the upper left corner of the iTunes software interface, then select "This computer", click the "Back up now" button, and then click "Don't back up the application" in the pop-up window, that is, click 1, 2, 3 and 4 in the following figure to export all the data in the mobile phone to the computer. Note: Please do not check "Encrypt iPhone Backup". If it is encrypted, the exported SMS will also be encrypted, so the subsequent recovery operation will not be completed. The backup time is related to the amount of software installed on your mobile phone, which may take several minutes to dozens of minutes. Please be patient. After the backup is completed, the progress bar at the top of the window will disappear. When you can't see the progress bar at the top, the backup has been completed. The following figure shows the window interface when a backup is in progress. Open the "PP Assistant" software and click "Toolbox" and "iTunes Backup Management", as shown below: Double-click the backup file you just backed up. On the left side of the pop-up window, we can see "SMS", click it, then click "sms.db" on the right, and then click the "export" button to export the file. Description: sms.db is the database file of sms. All deleted and undeleted messages are saved in this file. Open Louyue SMS recovery software, then click the menu file to open the SMS database file, and then select the sms.db file just exported. Then we click on the menu "File" and "Restore Deleted SMS", and then the software will start scanning. After a while, the software will pop up a window, prompting the number of messages successfully recovered. At this time, you can click on the mobile phone number list on the left to view all the deleted messages on Apple's mobile phone.