From the main screen, select MENU. Utilize the 5-way navigation pad to highlight and the center button to select.
Select Settings & Tools.
Select Phone Settings.
Select Security.
Enter the security code. The default code is the last 4 digits of the phone number.
Select Edit Codes.
Select an option then press the center of the 5-way navigation pad to choose OK.
Phone Only
Enter the new code, re-enter the new code then select SET.
Calls & Services
Enter the current code, enter the new lock code, re-enter the new lock code then select SET. The default code is the last 4 digits of the phone number.