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Tip: To lock the device manually, press the
power key. A list of commands opens. Select
Lock phone.
● Lock if SIM card changed — You can set the device
to ask for the lock code when an unknown SIM card
is inserted into your device. The device maintains a
list of SIM cards that are recognized as the owner’s
cards.
● Closed user group — You can specify a group of
people to whom you can call and who can call you
(network service).
● Confirm SIM services — You can set the device to
display confirmation messages when you are using
a SIM card service (network service).
Certificate management
Select Menu > Tools > Settings and General >
Security > Certificate management.
Digital certificates do not guarantee safety; they are
used to verify the origin of software.
In the certificate management main view, you can see
a list of authority certificates that are stored in your
device. Scroll right to see a list of personal certificates,
if available.
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.
View certificate details—check authenticity
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.
You are notified 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. The validity of
the certificate is checked, and one of the following
notes may be displayed:
● Certificate not trusted — You have not set any
application to use the certificate.
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