Samsung unlock codes are different then service codes.

All Type Samsung Phones (old modeles)

NAM programming: 47*869#08#9
Test mode: *759#813580 or 5809540*45680
exit test mode - 02
A-Key: menu + 0, code 25##

Samsung A500
1. Enter ## and the 6 digit OTKSL
2. SERVICE MENU will appear and 1.Basic will be highlighted
3. Press OK
4. Device will display NAM CDMA/ Phone Number
5. Enter 10 digit MIN
6. Press OK (3 times)
7. Display will return to Service Menu. Press END.
8. Programming is complete

Samsung N240 and N400
1. Enter ## and type in the 6 digit OTKSL
2. The display will show SVC MENU and 1. Phone Number
3. Press OK
4. Enter the 10 digit MIN and press OK
5. The display will show NAM with Home SID on the second line (Note: SID is no longer used)
6. Press OK
7. The display will return to the SVC MENU
8. Press END to complete the programming

Samsung Uproar
1. Press MENU key
2. Enter 9 2 0
3. Enter the OTKSL
4. At SVC Menu screen press OK
5. Enter MIN and press OK 4 times
6. Enter SID (4654) and press OK
7. Press END key
8. Programming is complete

Samsung N300
1. Press ## followed by the OTKSL
2. SVC menu will be displayed
3. Press 1 for Phone #