Abstract: An accessory attaches to the outside of a dial telephone, fits around the dial, and has a main switch actuated by movement of the handset of the telephone. The accessory includes a rotatable element arranged to encircle the dial and a dialing switch responsive to rotation of the element and the dial to produce pulses as a number is dialed. Electronic logic circuitry processes the pulses from the dialing switch and operates displays for displaying a dialed number digit-by-digit and for spacing the dialed digits into groups conforming to telephone number digit groupings for local calls, long distance calls within the calling area, and long distance calls outside of the calling area. The accessory also preferably provides dashes between groups of displayed digits and includes a timer for automatically measuring and displaying the elapsed time of a call.