An apparatus and method for monitoring and discriminating cell phone use (voice and text) in a vehicle from the exterior of the vehicle is provided. Cell phone use indicator lights are positioned on the exterior of a vehicle and wirelessly connected to or hardwired to cell phone use detection sensors located in seats and/or within the vehicle cabin to provide site specific information about specific cell phone use in the vehicle based on radio wave frequencies emitted by one or more cell phones in use in the vehicle. One or multiple indicator lights grouped in cluster arrangements to simulate the seat arrangement in a vehicle can be implemented. The apparatus may also be used in aircraft to monitor passenger electronic device use remotely from within the aircraft.