AT&T iPhone 4S 5.1 even though can be unlocked via Gevey sim but its better to have a factory Unlocked phone since then with every Update i dont have to get a new Gevey sim and since according to my knowledge basebands on iphone 4S cant be preserved. I thought that getting it factory unlocked would be the wise option. Plus i got it at a good deal on craigslist.
You sound like a salesperson for your website.