Nokia 6620 User Manual page 82

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 one of the following:
• Default—Activate the default group agreed on with the network operator.
• On—Use another group (you need to know the group index number).
• Off—Do not use closed user groups.
When calls are limited to closed user groups, calls still may be possible to the
official emergency number programmed into your phone.
Confirm SIM services (network service)—Sets the phone to display confirmation
messages when you are using a SIM card service.
Restore server—Reset your connection settings allowing you to receive new
settings from your service provider.
Certif. management
Options in Certif. management are
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. Scroll right 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, for example, when you want to do the following:
• Connect to an online bank or another site or remote server for actions that
involve transferring confidential information.
• Decrease the risk of viruses or other malicious software and be sure of the
authenticity of software when downloading and installing software.
Even if the use of certificates makes the risks involved in remote connections and
software installation considerably smaller, they must be used correctly in order to
benefit from increased security. The existence of a certificate does not offer any
protection by itself; the certificate manager must contain correct, authentic, or
trusted certificates for increased security to be available.
Certificates have a restricted lifetime. If Expired certificate or Certificate not
valid yet is shown, even if the certificate should be valid, check that the current
date and time in your phone are correct.
Nokia 6620 User Guide
Certificate details, Delete,
69
Settings
Trust settings, Mark/
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