Guys at xda developer have worked on the Samsung Galaxy S unlock and have given the complete procedure to unlock this phone. The Samsung Galaxy S has other variants mainly the Vibrant and the Captivate.
While rooting is not essential, it does give you few additional benefits including wifi tethering. This unlock procedure also applies to GT-I9000 and IBM-I9000 phone. So here are the notes.
– Apparently the any model higher than FW T959UVJI6 for Vibrant will not work.
– The method seems risky for i9000 phones so caution is advised.
Notice that your phone may render useless due to many reasons, you should understand the risk involved in following the method.
The heading at the amazon says – “Samsung I9000 Galaxy S Unlocked GSM Smart Phone”, however, customers have complained that amazon shipped them wrong unlocked phone. It is still not clear whether Amazon is directly selling the unlocked i9000 Galaxy S phone.
Unlock method via – xda-developers