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SIM unlocking your smartphone allows you to use it on any network (AT&T phone on T-Mobile, SFR phone on Orange network etc.). sanfranx415 @ XDA found the unlock code for the Samsung Galaxy S 4G on T-Mobile, this hack requires a rooted device and an hex editor and will allow you to use your Samsung Galaxy S 4G on any carrier.
Please note that we will not be responsible if you end up bricking your device. Rooting or customizing your device can be risky, if you follow the instructions you should be fine!
SIM unlocking the Samsung Galaxy S 4G requires a rooted device, you can use SuperOneClick to root / jailbreak it. See our SuperOneClick article @  SuperOneClick - One-Click Root for Android devices.
All the credits for this SIM Unlock procedure go to sanfranx415, FROZ3N and SS2006.
Follow these steps to SIM unlock your Samsung Galaxy S 4G [from XDA]:

1. Install "010 Hex editor" you can use trial does not have to be registered
2. Go to your SGS 4G and open a terminal emulator (free on the Market) - (Root Required)
   *** Dont forget the (su) command *** after the second line
   _____
   after opening a terminal emulator type the following
   cd /dev/block
   su
   dd if=/dev/block/bml3 of=/sdcard/bml3.bak
   Go find the file on your SD Card and transfer it to your computer
3. Open 010 Hex Editor
4. In 010 Hex Editor go to the Menus above and select VIEW>LINEFEEDS>SELECT CUSTOM>SET YOUR BYTES TO "32" Nothing Less
5. Locate the bml3.bak file you created and transfered to your computer and open it using the editor
6. Using your keyboard select CRTL+F to search for a hex string, when the search window pops up select "Hex byte" in the Type field and then search for the following string below:
   "FFFFFFFFFF0100000000" ALL TOGETHER, Then Hit the FIND ALL button to the right, some of you will get 2 results and others up to 10 results on your screen below
7. If you look at your Hex editor there are 3 window panes on the selected line (See Image Below)
   e.g 4CCC60h 01 01 01 01 yyyyyyyyy h.t .t p / / i1201.photobucket . com /albums/ bb359/sanfranx415/unlock.jpg
8. Go through each result from the above search and you will see on the 3rd window pane (as shown on pic above) after the hex keys there is an 8 DIGIT CODE (Write this code Down) this is your unlock code NCK for your phone
   Sidenote: THIS 8 DIG CODE SHOULD SHOW ON AT-LEAST ONE MORE RESULT CHECK ALL YOUR RESULTS FROM THE SEARCH ABOVE IF YOU HAVE ANY DOUBTS ( SOME OF YOU WILL HAVE YOUR CODE SHOWN AT-LEAST 2 TIMES AND SOME OF YOU WILL HAVE THE CODE SHOW MORE THAN 4 TIMES BUT YOU SHOULD NOT HAVE THAT MANY RESULTS )
   **** TO INPUT THE UNLOCK NETWORK CODE DO THE FOLLOWING ****
9. Turn off your phone
10. Insert a foreign SIM card not attached to your current provider (e.g if you have T-mob use an ATT SIM CARD) and turn on your phone
11. You will be prompted to enter a Network Unlock Control Key ( Use the code above that you wrote down and type it in your phone exactly)
12. After entering your NCK please hit Unlock or GO button and you should see a screen that says "network unlock successful" and your phone should go in the main screen after your phone has been unlocked.

You can get more information @ http://forum.xda-developers.com/showthread.php?t=980157.

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