I have an iPhone 3gs 5.0.1 model mc136ll and i need to unlock it for tmobile. Is that possible? I tried for a few hours last night but everything i came across said this phone was made after the 35th week of 2011 because of the model number. But that is impossible because my brother has had the phone for over two years. So i guess my first question is if it is possible and if it is, then how do i do it? Thanks guys.