Abstract: An access controller is placed in series with a subscriber's telephone set and includes an off hook detector, a ring detector, a central office simulator and DTMF circuitry which cooperate with a microcontroller or microprocessor suitably programmed to select one of a multiple providers of services by generating an access code corresponding to one of the service providers in accordance with an algorithm which provides a desired distribution of usage by the subscriber. The controller inserts a five digit prefix, namely the access code into the dialed number. The access code allows the call to be routed through a specific long distance service provider telephone network. By inserting the access code into the dialed number the device selects a particular long distance carrier for the duration of the call. Access codes are stored in a memory list of the access controller.