You can unlock the Galaxy by using a simple download which can be find in the xda-developers forum thread. They have provided download for Windows and Mac versions. Best part is that you can roll back to the original state in any case the hack did not work.
It is a two step hack simply begins with downloading the Samsung Galaxy S Unlocker for Mac or for Windows and figure out the Network Control Key. Secondly and finally , you will power down and power up the phone and it will ask for the unlock code.
ZAGG invisibleSHIELD for Samsung Galaxy S i9000 (Screen)
Zagg Invisibleshield for Samsung Galaxy S I9000 (Full Body Maximum)
Reusable Screen Protector for Samsung SGH-T959 Samsung Galaxy S
