The present invention is a system and method of providing access to a telematics unit in a mobile vehicle. A telematics unit access request corresponding to the telematics unit is received, and a mobile identification number and a telematics unit identifier associated with the telematics unit are determined. The mobile identification number and the telematics unit identifier are compared with a database of identifier records, after which a calling-state message is sent to the telematics unit based on the telematics unit access request, the mobile identification number, and the telematics unit identifier.