Getting SIM unlock can be a pain and usually requires some wacky progress using hex editors, or paying a carrier or third party to give you the code. Since paying money for something you can get free is never preferable, and a lot of people don’t even know how to properly wield a hex editor, there will always be a use for tools that do it for you.
XDA Senior Member Grooby has put together a nifty Windows application that will run the otherwise difficult method originally created by XDA Recognized Developer Odia for people who are having trouble with it. You can find the original method in its development thread. The application works only for older models of the Samsung Galaxy S II I9100, as some users report the method not working with hardware versions 1.4 or beyond. The older version of the tool will work for users carrying a Samsung Galaxy S I9000.
Development for the tool is moving forward as the tool creators are attempting to make it compatible with later hardware versions of the Samsung Galaxy S II, so if it doesn’t work for you, keep an eye out in case a fix is finally found. If you happen to have the supported hardware, you can find the download links for both the old hardware Samsung Galaxy S II and the tool for the Samsung Galaxy S along with instructions in the original thread._________