Scan this with your phone to download and install the Galaxy S Unlock App
Or download the apk here.

Method 2 - Unlock via Windows

You can also unlock your Android phone via a Windows PC:

1. Download then extract - This zip file
2. Unzip and run the .bat file inside.
3. Look for the line "Network Control Key" the text string after it is your phone's unlock code.
4. Write the code down
5. Power off your phone and put in a "foreign" SIM Card. Enter the unlock code you wrote down when prompted.