A method and apparatus for an accessory device for a mobile host device is disclosed. An accessory device for interfacing with a mobile host device includes a communication channel designed to establish a bi-directional communication link between the accessory device and the host device. In some embodiments, the accessory device allows walkie-talkie communication between an accessory device and a mobile host device as well as control by the accessory device of functions of the mobile host device. In some embodiments, the accessory device allows simplified speed dial control of a mobile phone host device. In other embodiments, accessory devices provide walkie-talkie communication with a mobile host device and provide positioning information to a mobile host device so that an application on the mobile host device can track locations of a plurality of accessory devices. These and other embodiments are more fully disclosed herein.