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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.
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.
To show the confirmation messages sent between your phone and the network
when you are using the SIM services, select Menu > Settings > Phone > Confirm
SIM actions.
Accessing these services may involve sending messages or making a phone call for
which you may be charged.
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