How to retrieve deleted text message
How to retrieve deleted text message?
iPhone 8 Plus, iOS 11.4.1
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If you are NOT using iCloud syncing for Messages and you have a back up that contains the messages, you can restore the phone from your back up. Note that doing so will overwrite everything currently on the phone.
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
If you are using iCloud syncing for Messages, once you delete them, they are gone.