Nokia 6110 Navigator

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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:
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