Samsung SGH-P735MSATMB - Manual (Page 143)

Settings
142
FDN Mode
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 call 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
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.
Note: Not all SIM cards have a PIN2. If your SIM card does not, this
menu does not display.
Reset settings
You can easily reset your phone to its default settings.
Enter the 4- to 8-digit phone password and press the OK soft
key or
key.
Note: The password is preset to “00000000” at the factory. To
change this password, see page 141.