Using The Pin; Setting Alert Type; Key Guard - Panasonic GD55 Operating Instructions Manual

Idle > Menu > Phone Menu > Security > SIM Lock > Enter 4 – 8 digital
phone code > OK > Set (select On or OFF) > OK.
To set SIM Lock, set "Phone Code" in the Phone Lock menu.
Using the PIN(4 to 8 digits)
The PIN (Personal Identification Number) protects your SIM against
unauthorized use. If you enable the PIN, every time the phone is turned
on you will be prompted to enter the PIN.
The PIN2 controls security for the Fixed Dial and Call Charge metering.
If either PIN/PIN2 is entered incorrectly 3 times the phone will be locked
and then you will need to enter the PUK/PUK2 code. Contact your sevice
provider for the PUK/PUK2 code.
Note: If the PUK/PUK2 code is entered incorrectly 10 times, the SIM
will cease to operate permanently. All information sorted in the SIM will be
lost and the SIM will need to replaced. Contact your service provider for
more details.
Enabling/Disabling the PIN
Once you enable the PIN, you have to enter the PIN whenever you switch
the phone on.
Idle > Menu > Phone Menu > Security > Codes > PIN Control >
Enter PIN (Between 4 and 8 digits) > OK > Set (Select On or Off) > OK

Setting Alert Type

When required, the phone can be set up to vibrate or ring when a call is
received. Idle > Menu > Personalise > Alert Type Choose one type
from None, Ring & Vibration, Vibration only or Ring only.

Key Guard

This function can avoid you from pressing the keypad accidentally, such
as in the packet or purse.
Idle > Menu > Key Guard > Yes
After that, there will be a shown on the idle display.
Disable the Key Guard: Idle > Free > OK
7