Yes, if you are asking, "How I get it?", then phreddyl is right. There is no way to get that information except from the previous owner. If you can not contact the previous owner, you have a paperweight. If you can open the phone, check the contacts. The owner may be listed there. Or ask Siri who the phone belongs to. If it's stolen or lost phone, it should be returned to the owner.
Sent from my ancient but trustworthy iPhone 5