What is the Fixed Dial Number (FDN) feature on my mobile device?

Fixed Dialing Number (FDN) mode, if supported by your SIM card, restricts your outgoing calls to a limited set of phone numbers. When this feature is enabled, you can make calls only to phone numbers stored in the FDN list on the SIM card.

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Fixed Dialing Number

FDN Mode must be set to On in the Menu  > Settings  > Phone > Security > Set FDN Mode option before you can add, change, or delete contacts on the FDN List.

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