Samsung SGH-A308 - Manual (Page 56)

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FDN Mode
Menu 6.6
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 the
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, refer to menu option 6.7 below.
Change PIN2
Menu 6.7
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.
Note: Not all SIM cards have a PIN2. If your SIM card
does not, this menu option is not displayed.
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Change Password
Menu 6.4
The Change Password feature allows you to change your
current phone password to a new one. You must enter
the current password before you can specify a new one.
The password is factory set to 00000000. Once you have
entered a new password, you are asked to confirm it by
entering it again.
SIM Lock
Menu 6.5
When the SIM Lock feature is enabled, your phone only
works with the current SIM. You must enter the SIM
lock code.
Once you have entered the lock code, you are asked to
confirm it by entering it again.
To unlock the SIM, you must enter the SIM lock code.