switching carriers with the samsung captivate and vibrant

For the Samsung Galaxy S family, AT&T sells the Captivate and T-mobile sells the Vibrant. Like most cell phones, these Galaxy S phones are locked down to only work with the selling carrier. But the developers over at XDA have stumbled on the fact that the Samsung Vibrant and Captivate have ability to switch carriers already loaded on the phones. Using the technique, Engadget proved that they could switch the Captivate to T-mobile. Even cooler, the Vibrant was able to use AT&T’s network as well as the 3G features.