Samsung SGH-C327 - Manual (Page 109)

Settings
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Enable: you can only call phone numbers stored in the FDN list.
The FDN list is a separate address book and is managed separately
from the normal Contacts list. You must enter your PIN2.
Note: Not all SIM cards have a PIN2. If your SIM card does not, this menu does not
display. Furthermore, PIN2 is specific to a SIM card and you will need to ask the issuer of
the SIM card for the PIN2 code.
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. To reset your
phone:
1. In Idle mode, press the Menu soft key to access Menu mode.
2. Select Settings and highlight Reset Settings. Press the Select
soft key or the key.
3. Choose from the following:
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All
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Phone Settings
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Display Settings
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Sound Settings
4. Press the key to check/uncheck your selection