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How do I restore a deleted text message
iPhone SE, iOS 13
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If you're using iCloud Syncing for Messages, once you delete a message, it's gone.
If you're not using iCloud Syncing and you have a back up that contains the message, you can restore the phone from that back up:
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
Note that restoring the phone from a back up will overwrite everything currently on it.