Nokia E90 Communicator - Manual (Page 108)

19. Security
Fixed dialing
Select > Contacts > Options > SIM contacts > Fixed dial contacts .
With the fixed dialing service, you can restrict calls from your device to certain phone numbers. Not all SIM cards support the
fixed dialing service. Contact your service provider for more information.
When fixed dialing is activated, calls may be possible to the official emergency number programmed into your device.
1. To restrict calls from your device, select
Options > New SIM contact and enter the contact name and phone number to the
list of numbers to which calls are allowed, or select Add from Contacts to copy the contact from Contacts. To restrict calls by
a country prefix, enter the country prefix in the list of numbers. All phone numbers to which calls are allowed must start with
this country prefix.
2. Select Options > Activate fixed dialling . You need your PIN2 code to activate and deactivate fixed dialing or edit your fixed
dialing contacts. Contact your service provider if you do not have the code. To cancel the service, select Options > Deactivate
fixed dialling .
Tip: To send text messages to the SIM contacts while the fixed dialing service is active, you need to add the text message
center number to the fixed dialing list.
Certificate manager
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.
Select > Tools > Settings > General > Security > Certificate management .
Digital certificates are used to verify the origins of software but do not guarantee safety. There are three different types of
certificates: authority certificates, personal certificates, and server certificates. During a secure connection, a server may send a
server certificate to your device. Upon receipt, it is checked through an authority certificate stored on your device. You receive
notification if the identity of the server is not authentic or if you do not have the correct certificate in your device.
Download a certificate from a web site, or receive a certificate as an e-mail attachment, or as a message sent through a Bluetooth
or infrared connection. Certificates should be used when you connect to an online bank or a remote server to transfer confidential
information. They should also be used if you want to reduce the risk of viruses or other malicious software, and to check the
authenticity of software when you download and install software to your device.
Tip: When you add a new certificate, check its authenticity.
Certificate trust settings
Trusting a certificate means that you authorize it to verify web pages, e-mail servers, software packages, and other data. Only
trusted certificates can be used to verify services and software.
To change trust settings, select a certificate and
Options > Trust settings . Select an application field and Yes or No . You cannot
change the trust settings of a personal certificate.
Depending on the certificate, a list of applications that can use the certificate is displayed:
•
Symbian installation — New Symbian operating system application.
• Internet — E-mail and graphics.
• App. installation — New Java™ application.
• Online certif. check — Online certificate status protocol.
View certificate details
You can only be sure of the correct identity of a server when the signature and the validity period of a server certificate have
been checked.
To view certificate details, select
View details .
One of the following notes may appear:
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