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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.
17. 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.
SIM services
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