If you recently purchased — or have plans to purchase — a phone in the Samsung Galaxy S line, the folks over a xda-developers have a pretty interesting tutorial up on their forums. The instructions detail how to carrier-unlock your Galaxy S phone (e.g. Captivate, Vibrant, etc.) without the need to pay for a SIM unlocking service. The process is four steps long and looks to be a 4 or 5 out of 10 on the difficulty scale. Hit up the read link if you want to give this one a shot… and do let us know if you have any success.