A telematics method and system includes, and uses, a telematics device with a controller in communication with a diagnostic system configured to receive diagnostic information from a host vehicle; a position-locating system configured to determine location information of the host vehicle; a wireless transceiver configured to transmit and receive information through a wireless network to and from at least one Internet-accessible website; and, a communication interface including at least a short range wireless interface link. The telematics device may be embodied in an access device, which may include the position-locating system. The access device may be a smartphone, or similar device, that retrieves/transmits diagnostic data/information, and other data/information to/from the vehicle via the short range wireless link. The access device performs various telematics device functions; it uses a long range wireless interface to communicate diagnostic and related information to a central host computer, and to receive related information from same.