Nokia 6260 User Manual page 132

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.
In the certificate management main view, you can see a list of authority
certificates that have been stored in your phone. Press to see a list of personal
certificates, if available.
Authority certificates are used by some browser services, such as banking services,
for checking signatures or server certificates or other authority certificates.
Server certificates are used to improve security in the connection between the
phone and the gateway. The phone receives the server certificate from the service
provider before the connection is established and its validity is checked using the
authority certificates saved in the phone. Server certificates are not saved.
Server certificates may be needed when you, for example:
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