I bought a used iphone 5 with no sim and i don't know it's carrier?

(It was posted as unlocked, but isn't) can I set this up with itunes? I can't access anything beyond the "hello. Hallo." screen. Or the Wi-Fi setup screen without the sim. I need to know if I can set this up with itunes, or can I go to tmobile, that is who i might switch to, and ask them to tell me its carrier? The woman hasn't replied to my calls in a week, and finally the husband answered with a really bad attitude saying that his wife was out of town and said take it to verizon wireless and they'll unlock it for $5. But its not a verizon phone, nor am i verizon customer! When i told him that he said "thats why I don't buy nothin' off craigslist!" and hung up. I don't really know what to do, I'd appreciate some guidance!

Well hello fellow Atlanta resident! Anyhoo it sounds like they sold you a stolen phone which is common especially on craigslist. I don't know which carrier use sim cards but you may want to contact your preferred carrier and ask them if they can active the phone. They should be able to tell you is the phone is okay to activate or unusable. If unusable you can have it services to be "cleaned" and truly unlocked. Hope you get it sorted out.