Abstract: A telecommunications interface system is operably coupled to customer premises termination equipment such as a telephone or facsimile machine for controlling signal transmissions to and from a public or private communication network. The interface system can be incorporated into the termination equipment, or can be contained in a housing that is externally connected between the termination equipment and a wall jack providing access to the telecommunications network. The interface system has a memory device for storing data representative of information such as long distance access codes and service providers. Each access code provides access to a long distance service provided by a service provider. A data processing system is provided that performs data processing functions on data stored in the memory device. The interface system also includes a visual display device for displaying information relating to one of the long distance providers based upon data stored in the memory device.