hello everyone, I'm trying to purchase an at&t iphone 4 for my brother in college who is with t-mobile via craigslist. I havent been doing the unlock thing since the first iphone so i am behind. I have been looking into purchase getting it unlocked via ebay. Is it really that easy to get the iphone 4 unlocked nowadays? Will they be able to unlock any software i.e i0s6? Thanks in advance.