Pantech PG-3500 - Manual (Page 73)

Call Barring Password (4 digits)
The call barring password is required when you use the Call
Barring function. You obtain the password from your service
provider when you subscribe to this function.
You can change this password using the Call barring menu
option.
(For further details, see Applications Menu 6.8)
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The following section describes various security codes.
PIN code (4 to 8 digits)
The PIN (Personal Identification Number) code protects
your SIM card against unauthorised use. The PIN code is
usually supplied with the SIM card. If you input the incorrect
PIN code entry three times in a row, the PIN code will be
blocked. If the PIN code is blocked, you need to unblock the
PIN code before you can use the SIM card again. See
information on the PUK code.
PIN2 code (4 to 8 digits)
The PIN2 code, supplied with some SIM cards, is required
to access some functions, such as call cost counters.
Lock code (4 digits)
The lock code can be used to lock the phone and keypad to
avoid unauthorised use.
PUK and PUK2 codes (8 digits)
The PUK (Personal Unblocking Key) code is required to
change a blocked PIN code. The PUK2 code is required to
change a blocked PIN2 code. If the codes are not supplied
with the SIM card, contact the operator whose SIM card is in
your phone for the codes.
You can change the following codes: lock code, PIN code,
and PIN2 code. These codes can include the numbers from
0 to 9 only.
Access Code
NOTE: The factory setting for the lock code is 1234. To avoid
unauthorised use of your phone, change the lock code. Keep the new
code secret and in a safe place separate from your phone.
Access Code
NOTE: Avoid using access codes similar to the emergency numbers,
such as 112, to prevent accidental dialling of the emergency number.