Why my text messages disappear?
Please correct this ASAP.
iPhone XR, iOS 14
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If you were using iCloud with Messages and deleted them, they are gone permanently. If you were not using iCloud with messages you may be able to restore them from a backup but only if you are prepared to revert the entire contents of your device back to the time when the backup was made. Refer to the link below for details.
See this Apple Recommended 2021 post by ASC contributor Chris0107: https://discussions.apple.com/thread/252570738?answerId=254843299022#254843299022