Abstract: A system to identify a non-approved mobile device includes a scanner for mobile devices. The scanner may be deployed in a vehicle or in a building to detect the location of non-approved mobile devices therein. The scanner may receive RF transmissions from mobile devices located within the range of the scanner. Such mobile devices may be located within, outside, or proximal to the vehicle or building. Based on unique identifying signals, the scanner may classify the devices as approved, non-approved, or transient. The scanner may be in data communication with data storage capacities located within the scanner or accessible through wireless communication. Approved mobile devices may scan for transmissions within their environment and relay information to the scanner.