Nokia 100
Find "Change PIN2 code"
Press Menu.
Scroll to Settings and press Select.
Scroll to Security settings and press Select.
Scroll to Change access codes and press Select.
Scroll to Change PIN2 code and press Select.
Change PIN2
Key in your current PIN2 (default is 1111) and press OK.
Key in a new PIN2 and press OK.
Key in the new PIN2 again and press OK.
Exit
Press Disconnect to return to standby mode.