Ok stupid me. I bought a Nexus 4 from a guy off craigslist. He turned the phone on and all functions worked. I didn't have the sim pin and nor did he so I was not able to insert my sim card and check. Once I got home, and put my sim card in the phone keeps deleting everything. ESN check on Swappa is clear. Now the guy does not pick up my calls texts and his phone is off. Am I stuck with a paperweight? What are the legal ramifications?