Open the Messages app
Tap Edit or Filters in the top-left corner
Tap Show Recently Deleted
Select the conversations or messages you want to recover
Tap Recover
Confirm by tapping Recover Messages
Restore from an iCloud backup if the messages are not in Recently Deleted
Restore from a Mac or PC backup if you previously backed up your iPhone
Check other Apple devices signed in with the same Apple ID
Contact your carrier to ask whether message records are available
Use a third-party recovery tool only if you understand the risks and limitations