Will sprint unlock my iPhone 5s?

Bought a 5s off Craigslist. Was told it was unlocked. Turns out its sprint. I've heard they're awful with unlocking for other carriers I have verizon though. Has anyone had good luck with these people? Just wasted so much money

The short answer is; probably not. A lot of carriers all around the world make money and profit by locking, not unlocking. If the person completed their contract then it should be easy however if they haven't then you probably will find some trouble. A lot of people I know have not managed to unlock unless their contract is up. The best thing you can do is give them a call or go into your local Sprint store, explain the situation and see what they can do. Otherwise you may be able to find 3rd party unlocks who require a small fee and could do it for you. Best of luck.

P.S never buy locked phones.