It seemed to good to be true but since eBay offer the buyer a lot of protection and the cost was a fraction of what many other websites were offering, I decided to buy an unlock code for my wife's GSM iPhone 5 for u$d9 off of eBay from this seller. I had used eBay to successfully find an unlock code for my own Samsung Galaxy 3 a few months earlier so I had at least a little optimism. Sure enough 24 hours later I got an unlock code which iTunes confirmed unlocked the iPhone 5.
I believe this seller probably has a contact in AT&T to assist the process but I don't really care so long as it works and I confirmed by popping an Irish SIM card (3 Network) into the phone while visiting Dublin a few weeks back and it worked like a lucky Irish charm. The price has now dropped to less than u$d6 which is less than the cost of a SIM card in many countries. Enjoy the savings brought to you by PADDY in BA. Also check out my previous posts on unlocking iPhones here and here. Check out the rest of my travel hacking tips here.