Bought a iPhone 5s bad esn reported missing?

So basically my older brother lost his iphone at a party and had insurance so he paid for a replacement one and later on like a week later his friend found his lost phone and my brother sold it to me since he got a new one through the mail but I was wondering if there's anyway I can connect it to my line since my phone is broken we both have sprint

Bad esn means you can never use it as a phone. You could use it as an ipod touch.

No, a blacklisted (bad esn) phone is unless as a phone forever, ask him for your money back.

If you can remove the blacklist from the phone, you can use it on Sprint again. There are ways to get around it. If you need help with getting the phone unblocked, mail me for references.