IPhone 5c Sprint 16gb blue issue?

I bought a iPhone 5c from someone on craiglist a few days ago and he told me it was unlock. When I went to check the phone to activated, I found out it was not unlock, but lock. Is there a way that I can unlock a the phone a website or somewhere in my city. I also want to check if the phone was either lost or stolen, I do not plan to get in trouble just for some dumb phone. Again the phone is Sprint blue and its a iPhone 5c so if anyone could please help me out I really, really would appreciate it.

Well what you do to Unlock it is go to the carrier and have them unlock it. Barack Obama has said in his speech that it is illegal if they don't unlock your device if you want it unlocked.