Although IEEE has already announces 802.11p standard for wireless access in vehicular environment (WAVE) to support Intelligent Transportation System (ITS) communication, but it’s requires additional 802.11p hardware equipment to let vehicles communicate with others using 802.11p. Therefore, we proposed an inter-vehicle communication system operating on android smartphone using Wi-Fi in this paper in order to substitute 802.11p onboard unit (OBU) before it’s widespread on modern vehicles. Experiment results shows that our system can not only be easily install to any android devices (android 2.3 and above) but also more suitable for vehicular ad hoc network (VANET) scenario than other systems.