What Is Fixed Dialing Numbers?

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What Is Fixed Dialing Numbers?

In the realm of telecommunications, maintaining control over outgoing calls and ensuring security is of paramount importance. Fixed Dialing Numbers (FDNs) provide a solution by allowing users to restrict outgoing calls to a predefined list of authorized numbers. In this blog post, we will delve into what FDNs are, how they work, and the benefits they offer in terms of control and security. Get ready to explore the world of FDNs and understand their applications in different industries.

Understanding Fixed Dialing Numbers (FDNs):

Fixed Dialing Numbers (FDNs) are a feature offered by telecommunications networks and devices that enable users to restrict outgoing calls to specific numbers. With FDNs, users can create a whitelist of authorized numbers, and outgoing calls can only be made to those pre-approved contacts. FDNs are commonly used in situations where strict control over outgoing calls is necessary, such as in business environments, government institutions, and specialized communication systems.

How Fixed Dialing Numbers (FDNs) Work:

  1. Whitelist Creation: To use FDNs, users must create a whitelist of approved numbers. This list typically includes phone numbers that are allowed to receive outgoing calls from the device or network. The whitelist can be managed through device settings or network configurations, depending on the specific implementation.
  2. Call Restrictions: Once the whitelist is established, the FDN feature restricts outgoing calls to only those numbers on the approved list. Attempts to dial numbers outside the whitelist are blocked or rejected by the device or network. This control mechanism ensures that calls can only be made to authorized contacts.

Benefits Of Fixed Dialing Numbers (FDNs):

  1. Enhanced Control: FDNs provide a high level of control over outgoing calls, allowing organizations to manage and restrict communication effectively. This is particularly useful in situations where precise control over call permissions is required, such as in corporate environments, government agencies, and sensitive communication networks.
  2. Security and Cost Management: FDNs help enhance security by limiting outgoing calls to approved numbers, reducing the risk of unauthorized usage or fraudulent activity. By controlling outgoing calls, organizations can also manage and optimize telecommunications expenses, ensuring that calls are made only to authorized contacts.
  3. Streamlined Communication: FDNs can simplify communication by restricting outgoing calls to a predefined list of important contacts. This can be beneficial in situations where frequent and direct communication with specific individuals or organizations is essential, such as emergency services, support hotlines, or critical business partners.
  4. Compliance and Regulatory Requirements: FDNs can assist organizations in adhering to compliance and regulatory requirements. By limiting outgoing calls to approved numbers, organizations can ensure compliance with industry-specific regulations or internal policies related to communication and data protection.


Fixed Dialing Numbers (FDNs) provide a valuable tool for controlling and securing outgoing calls in telecommunications. By creating whitelists of authorized numbers, FDNs enable organizations to enhance control, improve security, and streamline communication. Whether it’s managing communication costs, ensuring compliance with regulations, or restricting calls to critical contacts, FDNs offer a powerful solution in various industries and scenarios. By leveraging the benefits of FDNs, organizations can achieve greater control and security over their telecommunications networks and devices.

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What Are Fixed Dialing Numbers Used For?

Fixed Dialing Numbers is a feature in which you can pre-define a list of phone numbers that may be dialed from this phone, and any other numbers are blocked unless a PIN is entered.

What Are Fixed Dialing Numbers About On My Phone Settings?

Definition(s): a set of phone numbers kept on the SIM that the phone can call exclusively of any others (i.e., all other numbers are disallowed).

What Are Fixed Dialing Numbers On Android?

FDN (Fixed Dialling Number) or FDM (Fixed Dialling Mode) is a service mode of a GSM phone’s Subscriber Identity Module (SIM) card feature that allows the phone to be “locked” so that it can only dial certain numbers, or numbers with certain prefixes. Incoming calls are not affected by FDN service.

How Do I Disable Fixed Dialing Numbers?

Find “Fixed dialing numbers”

  1. Press Phone.
  2. Press the menu icon.
  3. Press Settings.
  4. Press More settings.
  5. Press Fixed dialing numbers.
  6. Press Enable FDN.
  7. Key in your PIN2 and press OK.
  8. Press Disable FDN.


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