Samsung 08/2004 - Manual (Page 162)

Phone settings
161
SIM lock
To enable the SIM lock feature, you must enter a
new four- to eight-digit SIM lock code, and confirm
it by entering it again.
The following options are available:
Disable: you can use any other SIM cards with
your phone.
Enable: you must enter the SIM lock code to use
another SIM card with your phone.
To unlock the SIM, enter the SIM lock code.
FDN mode
The FDN (Fixed Dial Number) mode, if supported by
your SIM card, allows you to restrict your outgoing
calls to a limited set of phone numbers.
The following options are available:
Disable: you can phone any number.
Enable: you can only call phone numbers stored in
Phonebook. You must enter your PIN2.
Note: Not all SIM cards have a PIN2. If your SIM card
does not, this menu option is not displayed.
To change your PIN2, see the Change PIN2 menu
option below.
Change PIN2
The Change PIN2 feature allows you to change your
current PIN2 to a new one. You must enter the
current PIN2 before you can specify a new one.