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you want to use another group (you need to know the group index number), select
On.
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 device to display confirmation
messages when you use a SIM card service
Certificate management
A list of authority certificates that have been stored in your device 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.
When security features that restrict calls are in use (such as call barring, closed user group,
and fixed dialing), calls may be possible to the official emergency number programmed into
your device.
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.
The device notifies you if the identity of the server is not authentic or if you do not
have the correct security certificate in your device.
To check certificate details, scroll to a certificate, and select Options > Certificate
details. While opening the certificate details, the device checks the validity of the
certificate and one of the following notes may appear: