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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 is similar to 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 
is shown.
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