Someone sold me an iphone that is locked? What can i do?

I bought this iphone 4 from someone on CL and he claimed it was at&t Unlocked. I met with him, looked at the phone, seemed nice.paid and everything and we left. I tried my T-mobile Sim and it doesn't work on the phone. Contacted him but he wouldn't answer… I called at&t to unlock it but they want the phone number registered on it and the 1st and last name. What can i do? Can i threaten to sue him for my money back? I have his phone number and license plate.

How to get my contacts back? - 2

So my mom blocked and deleted all my contacts, I yelled at her, even started crying about it so she tried getting them back claiming there's a way. If there's a way, how? Cause most of my friends have no other social media. I have a iPhone 5c btw

ITunes - iPhone syncing issues?

Bought loads of songs on my laptop and uploaded some CD's but for some reason no amount of syncing puts them on my phone. Any help?

Two iPhones on one Apple ID?

So I have my own personal iPhone 6 and an iPhone 5 supplied for my job. Can I sync both to my Apple ID and use apps I've bought on both devices? Say like my tomtom sat nav app. Can I have that on both devices so whether I need it for work or personal use I can just use the appropriate iPhone?

My iPhone 6 is bent what now?

I woke up this morning and I took my phone out of my pocket and it was bent am I covered by any type of warranty?
I live in Australia by the way

Why can't I send photos in text messages on my iphone 5s?

I can't get any photos to send from my messages unless it's using imessage or i have cellular data on. I'm connected to Wi-Fi and it still doesn't work. On my old basic phone I could send pictures with just service and I have the same carrier.