Just a heads up . You can now unlock the Samsung Galaxy S2 for free.
No need to pay the network or websites. And easy to do if you have root.
Check post 2 for the method :)
This method will give you your unlock code. You then just enter it on your phone. Its the same code you would get from your network provider.
To do this you have to be rooted ! You can always unroot after if you wish.