Abstract: A fully functional writing pen having incorporated therein electronic circuitry including a miniature microphone and earpiece speaker serving as a handset in a cordless telephone system. The cordless pen handset microphone and earpiece communicate via an ultrasonic link to an ultrasonic transceiver provided in a portable, pocket-sized keypad telephone dialer, which provides a cordless RF link to a base station connected by conventional means to a telephone network. The keypad dialer also may communicate on a cellular phone network using a transvertor as an adaptor, alternatively direct person-to-person communication with DPRS handsets or other similarly equipped users is possible without the telephone network. A set of depressable control buttons on the pen body enable fingertip control of the cordless telephone system, including an on-hook/off-hook switch control button and mute control button for private conversation screening during telephone calls.