How to enter code in Samsung B2100

To enter unlock code for most samsung:
1. insert a foreign sim card
Enter the PIN if the card has it
3. now enter code NCK
the phone is unlocked

If your phone does not ask for unlock code should be:
1- Switch ON your phone with a non accepted SIM Card,
2- Compose: #7465625*638*CODE# (or *#7465625*638*CODE#) or #0111*CODE#