In general techniques are described by which to provide switchable communication transport for communication between primary devices and vehicle head units. A primary device comprising a memory and a processor may be configured to perform the techniques. The memory may store an operating system and an application. The processor may execute the operating system to present a single communication interface by which the application establishes a first transport between the primary device and a vehicle head unit that facilitates execution of a mode in which the application provides data for presentation by the vehicle head unit. The processor may also execute the application to transmit, during execution of the mode, the data via the first transport, where the operating system switches, during execution of the mode, from the first transport to a second transport. The application transmits, during execution of the mode, the data via the second transport.