Nokia 3230 - Manual (Page 150)

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Fixed dialling - You can restrict your outgoing calls to selected phone numbers, if
supported by your SIM card. You need the PIN2 code for this function. When this
function is active, you can only call those phone numbers that are included in the
fixed-dialling list or which begin with the same digit(s) as a phone number on the
list.
• Press the joystick to set Fixed dialling on.
• To add new numbers to the Fixed dialling list, select Options → New contact or
Add from Contacts .
Closed user group (network service) - You can specify a group of people whom you
can call and who can call you. For more information, contact your network
operator or service provider. Select:
Default to activate the default group agreed
on with the network operator, On if you want to use another group (you need to
know the group index number), or Off .
When security features that restrict calls are in use (such as call barring, closed user group
and fixed dialing) calls still may be possible to the official emergency number programmed
into your device.
Confirm SIM services (network service) - To set the phone to display confirmation
messages when you are using a SIM card service.
Certificate management
Options in the certificate management main view are: Certificate details ,
Delete , Trust settings , Mark/Unmark , Help , and Exit .