Change Access Codes (Menu 4-5-6)
With this menu you can change the access codes: security code, PIN
code, PIN2 code and barring password. These codes can only include
the characters 0 to 9. The phone prompts you to enter the current
code and the new code. It also prompts you to verify the new code
by entering it again.
NOTE: Avoid using access codes similar to the
emergency numbers, such as 112, to prevent
accidental dialling of the emergency number.