Samsung SGH-X427 - Manual (Page 89)

Phone Settings
84
The password is preset to “00000000” at the factory. Once
you have entered a new password, you are asked to
confirm it by entering it again.
SIM Lock (Menu 4.5.5)
When the SIM Lock feature is enabled, your phone only
works with the current SIM. You must enter the SIM lock
code to unlock the SIM so you can use a different SIM card.
Once you have entered the lock code, you are asked to
confirm your entry.
FDN Mode (Menu 4.5.6)
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 does not display.
Change PIN2 (Menu 4.5.7)
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. Once you have entered a new
PIN2, you are asked to confirm it by entering it again.