Nokia 6670 User Guide 77 Copyright © 2005 NokiaSettings• Decrease the risk of viruses or other malicious software and be sure of theauthenticity of software when downloading and installing software.Important: Note that even if the use of certificates makes the risksinvolved in remote connections and software installation considerablysmaller, they must be used correctly in order to benefit from increasedsecurity. The existence of a certificate does not offer any protection byitself; the certificate manager must contain correct, authentic, ortrusted certificates for increased security to be available. Certificateshave a restricted lifetime. If Expired certificate or Certificate notvalid yet is shown even if the certificate should be valid, check thatthe current date and time in your device are correct.Before changing any certificate settings, you must make sure that you reallytrust the owner of the certificate and that the certificate really belongs to thelisted owner.CHANGE THE TRUST SETTINGS OF AN AUTHORITY CERTIFICATEScroll to an authority certificate, and select Options > Trust settings. Dependingon the certificate, a list of the applications that can use the selected certificateis shown. For example:• Internet—The certificate can certify e-mail and imaging servers.• App. installation—The certificate can certify the origin of new software.• CALL RESTRICTION (NETWORK SERVICE)Select Menu > Settings > Call restriction.Call restriction allows you to restrict outgoing and incomingcalls with your phone. For this function, you need the restrictionpassword, which you can obtain from your service provider.Select Options, and choose one of the following:Activate—Request the network to set call restriction on.Cancel—Set the selected call restriction off.Check status—Check whether the calls are blocked.Edit restr. passw.—Change the restriction password.Cancel all restrict.—Cancel all active call restrictions.You cannot restrict incoming calls while call forwarding or fixed dialing is active.See "Call forwarding (network service)" on page 32. See also “Security” on page 75.When calls are restricted, calls still may be possible to certain officialemergency numbers.
