Nokia 6120 classic Manual Del Usuario página 99

When calls are limited to closed user groups, calls 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 use a SIM card service
Certificate management
A list of authority certificates that have been stored in your phone is displayed
in Certificate management. To see a list of personal certificates, if available,
scroll right.
Digital certificates should be used if you want to connect to an online bank or
another site or remote server for actions that involve transferring confidential
information. They should also be used if you want to reduce the risk of viruses
or other malicious software and be sure of the authenticity of software when
downloading and installing software.
Important: 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 device are correct.
Before changing any certificate settings, you must make sure that you really
trust the owner of the certificate and that the certificate really belongs to the
listed owner.
View certificate details and check authenticity
You can only be sure of the correct identity of a server when the signature
and the period of validity of a server certificate have been checked.
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