An improved rearview mirror mounted telephone system mounted in a vehicle comprises a rearview mirror assembly having a housing and a reflective member associated with the housing in such a manner as to enable said reflective member to properly function as a rearview mirror; and an RF transceiver mounted to, within or on the rearview mirror assembly for providing a communication link with the rearview mirror assembly. The RF transceiver may be in communication with a portable telephone when the portable telephone is connected to the RF transceiver. The RF transceiver may be a cellular telephone transceiver.