The present invention provides a mobile device configured with a display, keypad or other entry device, authentication transponder and wireless communication system. Through the use of the wireless communication system, a mobile device may communicate with a conveyance using wireless signals. The keypad or other entry device on the mobile device provides for the generation of conveyance control instructions such as automobile ignition, climate control, navigation settings and audio settings. An antenna at the conveyance receives the control instructions in the form of a conveyance control signal and executes an associated conveyance control command through onboard computers and power supplies whereby the engine may be started, the temperature changed, destination provided for navigation or stereo settings changed. This exchange of instructions may take place remotely from the interior of the conveyance. The display at the mobile device displays current conveyance conditions such as temperature, destination and audio settings.