A system for using a mobile phone in a vehicle includes an auxiliary jack having multiple conductors and configured to receive a connector having a first end to be coupled to the auxiliary jack and a second end to be coupled to a mobile device. The system further includes a ground coupled to a first conductor of the multiple conductors, and a microphone coupled to a second conductor of the multiple conductors that receives microphone data from a cabin of the vehicle to be transmitted to the remote device via the connector. The system further includes a first speaker coupled to a third conductor of the multiple conductors that outputs audio data received from the third conductor, and an IVI interface configured to receive user instructions for controlling the mobile device and to transmit the user instructions to the mobile device via at least one of the multiple conductors.