Nokia 5700 User Guide - Page 75

Certificate management, View certificate details and check authenticity, Lock if SIM card changed

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Page 75 highlights

Lock if SIM card changed-to set the phone to prompt for the lock code when an unknown, new SIM card is inserted into your phone. The phone keeps a list of SIM cards that are recognized as the owner cards. Closed user group (network service)-to specify a group of people whom you can call and who can call you. For more information, contact your service provider. To activate the default group agreed on with the service provider, select Default. If 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 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. 75

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75
Lock if SIM card changed
—to set the phone to prompt for the lock code when an
unknown, new SIM card is inserted into your phone. The phone keeps a list of SIM
cards that are recognized as the owner cards.
Closed user group
(network service)—to specify a group of people whom you can
call and who can call you. For more information, contact your service provider. To
activate the default group agreed on with the service provider, select
Default
. If
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 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.