Audiovox GSM 900 system - Manual (Page 50)

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Set Code Status (6-1)
The code status includes:
PIN code (6-1-1)
You can activate/deactivate the PIN code function here.
After you enter this function by pressing key, press key again
and the screen will display two options: “On” and “Off”. Use key
to select and press key to confirm. When you change the PIN code
status, you will be prompted to enter PIN.
Phone Code (6-1-2)
You can activate/deactivate the Phone Code function here.
After you enter this function by pressing key, press key again
and the screen will display two options: “On” and “Off”. Use key
to select and press key to confirm. When changing the
Activate/Deactivate status, you have to enter your phone code. (The
default phone code is 1234).