A while ago, we brought you a unique method of unlocking the Samsung Galaxy S 4G using a hidden code within the phone. It’s was unique because instead of using usual tools and methods that we all use now, this method involved using a hex editor to find the unlock code already buried in the files of the phone itself and using it to unlock the phone. It took some time, root access, and a hex editor, but it worked.
Now, the method is back again, this time for the Samsung Infuse 4G. Both methods were found by XDA Forum Member sanfranx415. As sanfranx415 explains:
All right ladies and gentlemen, coders and non coders again I have personally found the unlock code NOT THE FREEZE CODE only the unlock code for your Samsung Infuse 4G by ATT hidden in the same files as previous Samsung phones.
This procedure is similar to finding the unlock code for the Vibrant 4G for those that have performed my steps in the past it should be a no brainer but if not please once again read everything carefully its not hard but just takes patience Of-course this all depends on your dedication and time but hopefully I have simplified it for you.
This is very cool because instead of coercing this code out of your carrier—or paying to get it in some cases—you are using the code that came with your Infuse 4G, and you’re getting it yourself. As mentioned, the process is tedious but not overly difficult, and those who have followed these methods on older devices shouldn’t have a problem. For more info, go to the original thread.