Samsung SGH-X640 Manual page 81

Phone settings
Enable: you must enter the PIN each time the
phone is switched on.
To change your PIN, see the Change PIN menu
option below.
Change PIN
(Menu 9.4.2)
This feature allows you to change your current PIN
to a new one, provided that the PIN Check feature
is enabled. You must enter the current PIN before
you can specify a new one.
Once you have entered a new PIN, you are asked to
confirm it by entering it again.
Phone lock
(Menu 9.4.3)
When the Phone lock feature is enabled, the phone
is locked and you must enter the 8-digit phone
password each time the phone is switched on.
The password is preset to "00000000" at the
factory. To change the phone password, see the
Change password menu option below.
Once the correct password has been entered, you
can use the phone until you switch it off.
The following options are available:
Disable: you are not asked to enter the phone
password when you switch the phone on.
Enable: you are required to enter the phone
password when you switch the phone on.
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Change password
(Menu 9.4.4)
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 preset to "00000000" at the
factory. Once you have entered a new password,
you are asked to confirm it by entering it again.
Privacy
(Menu 9.4.5)
This feature allows you to lock or unlock the usage
of the phone contents, such as multimedia
messages, photos, images, and sounds.
To enable or disable the Privacy feature, you must
enter your phone password.
SIM lock
(Menu 9.4.6)
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
(Menu 9.4.7)
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.
Phone settings
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