Check the Messages app’s Recently Deleted folder
Open Messages
Tap Edit or Filters
Tap Show Recently Deleted
Select the messages
Tap Recover
Restore from an iCloud backup
Go to Settings
Tap General
Tap Transfer or Reset iPhone
Tap Erase All Content and Settings
Set up the iPhone again
Choose Restore from iCloud Backup
Restore from a computer backup
Connect the iPhone to a Mac or PC
Open Finder or iTunes
Select the iPhone
Choose Restore Backup
Pick a backup made before the messages were deleted
Check other Apple devices
Open Messages on iPad, Mac, or another iPhone
Look for the deleted messages if syncing is delayed or incomplete
Contact your carrier
Ask if SMS records or message logs are available
Use a third-party recovery tool
Install a trusted iPhone data recovery app
Scan the device or backup
Recover available deleted messages