Fixed Dialing Number

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Fixed Dialing Number (FDN) is a service mode of a GSM mobile phone's SIM card. [1] Numbers are added to the FDN list, and when activated, FDN restricts outgoing calls to only those numbers listed, or to numbers with certain prefixes. [1] A notable exception is that emergency calls to 000, 112, 911, 999 and the like are exempt. [2] Incoming calls are not blocked by FDN. [1]

One practical application of FDN is for parents to restrict the phone numbers their children can dial. [2] The SIM card's PIN2 must be entered beforehand or when applying such settings. [2]

References

  1. 1 2 3 "What Is FDN in Samsung Phones?". Samsung. 2020-10-13. Retrieved 2022-04-19.
  2. 1 2 3 "Calling Features on Your Samsung Galaxy Phone". Samsung. Limit Calling to Specific Numbers. Retrieved 2022-04-19.
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