What is fixed dialing numbers?

Fixed Dialing Numbers (FDN) is a feature that restricts the numbers that a user can dial from a mobile phone. It is commonly used by businesses to control and monitor the calls made by their employees.

FDN allows the user to specify a list of pre-approved numbers that can be dialed from the phone. Any attempt to dial a number not on the approved list will be rejected.

This feature can help prevent unauthorized or excessive use of company phones, reduce the risk of fraud, and control costs associated with phone usage.

FDN is typically managed by the phone service provider or system administrator, who can add or remove numbers from the approved list as needed.

It is important for users to carefully manage their FDN list to ensure that they can still make emergency calls and reach important contacts when needed.