Can i fix a blackballed ESN#?

I bought an iPhone on craigslist, and the seller didn't tell me it had a black balled ESN#. He used E-Mail and hasn't responded to anything i sent to him. It just says "Restricted Network" or "Network Lost"

Unfortunately there are no legal methods to bypass a blacklisted ESN. The phone has been either reported lost/stolen or is attached to an account that has a past due balance on it.

File a police report as you are a victim of fraud.