How to delete Apple's SMS?

Open SMS-Edit-Select all messages, and then delete. In this way, you can delete all the short messages.

If you want to restore SMS, you can use the following methods to restore it. SMS deletion is simple, but it will take some time to recover.

Recover through iCloud

Make an iCloud backup for your phone. When there is enough memory, iCloud will automatically back up the data in your mobile phone, and the content of the backup may be deleting the short message. Open the phone settings operation steps: click Settings-General-Restore-Erase all contents and settings.