AT&T used their cellbrite thingamajig to transfer contacts and whatever else they could from my Palm Centro to Inspire. The contacts made it over, but everything else is lost - text messages which I've been saving for almost a year - they're no longer on my Centro either.
Have you tried using a 3rd party application & saving the messages on your Centro to an SD card? You might then transfer the data to the Inspire. Or you might try synching the Centro to a desktop PC, then transferring to the Inspire.
If you don't have the Centro manual, you can quickly download the 326 page document to your desktop for quick reference. There are a couple of chapters that should address what you want to do.