Nokia 6230i

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Change signing PIN
 to change the signing PIN code for the digital 
signature. Select the signing PIN you want to change, enter the 
current PIN code, then enter the new code twice.
Certificates
Important: Note that 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.
To view the list of the authority or user certificates downloaded into 
your phone, select 
Menu
> 
Web
> 
Settings
> 
Security settings
> 
Authority certificates
 or 
User certificates
.
The security indicator 
 is displayed during a connection, if the data 
transmission between the phone and the content server is encrypted.
The security icon does not indicate that the data transmission between the 
gateway and the content server (or 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. 
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