Unlock iPhone IMEI

Hi, everyone. I have a problem and want you to tell me what to do. I've recently bought iPhone 4S. When I tried to unlock it you couldn't because it was running iOS 6 and 3.0.04 baseband. When I began to search info in the net I found out there was not other solution to unlock iOS 6 than IMEI unlocking method.
I used to Ultrasn0w fixer on my iPhone 3G without problems and for free but IMEI method is paid. After checking different service that offers that unlock I found att-iphone-unlock.com that offer to unlock AT&T iPhone for 9.99 bucks. First I thought that it was joke but after reading different forums people wrote that it is trustable service. I wonder can I trust it. Maybe here are their previous clients. Thanks for your help.

That is quite hard. I understand you sir.

hmm the website seems genuine you can give it a try for 10$