This question has been asked WAY too many times. I reckon you should check those answers out before asking again, or asking at all!
How Can I retrieve deleted text messages from iPhone without backup?
Sometimes , even you think you did not backup the lost data before, I still suggest you check your most recent iTunes or iCloud backup.
But if that doesn't help either, you can use data recovery tool to recover deleted text messages iphone.
Bitwar iPhone Data Recovery is a professional apple Recovery master, it can help you recover