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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.
There are three kinds of certificates: server certificates, authority certificates, and user
certificates. You may receive these certificates from your service provider. Authority certificates
and user certificates may also be saved in the security module by the service provider.
The security icon does not indicate that the data transmission between the gateway and the
content server (or the place where the requested resource is stored) is secure. The service
provider secures the data transmission between the gateway and the content server.
Digital signature
You can make digital signatures with your phone if your SIM card has a security module.
Using the digital signature can be the same as signing your name to a paper bill, contract, or
other document.
To make a digital signature, select a link on a page, for example, the title of the book you
want to buy and its price. The text to sign, which may include the amount and date, is
shown.
Check that the header text is Read and that the digital signature icon
To sign the text, read all of the text first, and select Sign.
The text may not fit within a single screen. Therefore, make sure to scroll through and read
all of the text before signing.
Select the user certificate you want to use. Enter the signing PIN. The digital signature icon
disappears, and the service may display a confirmation of your purchase.
15. SIM services
Your SIM card may provide additional services. You can access this menu only
if it is supported by your SIM card. The name and contents of the menu depend
on the available services.
Accessing these services may involve sending messages or making a phone call for which
you may be charged.
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