Check the Messages app’s Recently Deleted folder if available
Restore from an iCloud backup made before the texts were deleted
Restore from a computer backup using Finder on Mac or iTunes on Windows
Use Google Drive backup on Android if message backup was enabled
Check other synced devices for the missing texts
Ask the sender to resend the messages
Contact your mobile carrier to ask whether message records are available
Use a reputable data recovery tool if the device has not been overwritten
Stop using the device immediately to reduce the chance of overwriting deleted data
Enable automatic backups to prevent future loss