We're here for support. Was your device backed up via any type of Cloud storage?
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not sure if you have a MAC, but my MAC also seems to keep a file of my iPhone text messages - that being said I delete them regularly so I'm not sure HOW far back they go (more than 90 days)...
On my MAC home screen / finder screen, click on the "GO" pull down menu & with that open hit "OPTION" - this will make "LIBRARY" viewable. Click on Library and then the "Messages Folder." My old text messages are stored here, even if I delete them from my phone. Again, not sure how far back these go and i'm sure this is useless info if you don't have your phone synced with your computer, but just a thought.