Welcome to the forums.
Where did you get this device? From a 3rd party (Ebay, Craigslist, etc)?
If so, follow these steps:
Buying a BlackBerry off eBay - BlackBerryFAQ
We see lots of threads where people find lost devices and claim them as their own. I don't know if this is the case or not. Using my better judgment, I am not going to give any further information until I know for sure that this is not the case. I hope you understand.