Samsung SCH-1530 - Manual (Page 68)

Advanced Features
60
Lock Code Setting
The default lock code for your Samsung PCS Phone is 0000 or
the last four digits of your phone number, depending on
activation. You can enter a personal lock code, and then change
the lock code as often as you like.
To enter a new lock code:
1. Press to display the Main Menu.
2. Press for Security. The Lock Code screen displays.
3. Enter the existing four-digit lock code to access the
Security menu.
4. Press for Lock Code.
5. Enter a new, four-digit lock code by pressing the digit keys.
6. Press to save the new lock code.
Note: The lock code does not display. When you enter a new
lock code, make a note of the code and keep it for reference.