A mobile asset cellular device transmission detector system and method comprises a mobile asset cellular device transmission detector, a wireless processing unit, an event recorder, and a digital video recorder. The wireless processing unit includes event recorder interface software, digital video recorder interface software that obtains data from the digital video recorder, wireless navigation (Wi-Nav) software that obtains data from the Wi-Nav, global positioning system (GPS) software that obtains data from a GPS and geo-fence software. The cellular device transmission detector continually checks for cellular device transmissions within a mobile asset and whether those transmissions were associated with an impact, rollover, operator action or geo-fence defined location and/or boundary. When a cellular device transmission was made, the wireless processing unit triggers an episode and sends event recorder information, GPS location and speed, audio and video recordings, and impact and rollover information to a back office.