For a iPhone 3GS with a IOS version 4.1(with cydia) is it possible to upgrate to 6.1.3(or something above 5) and unlock.
iTunes gives update for 6.1.3 . While evad3rs have unclocked till version 6.1.2 .
How can such an upgrade be possible. I know that first of all I have to upgrade through iTunes. But will I be available to unlock after that?