The National Association of Broadcasters (NAB) has brought a previously hidden iPhone feature to light. Almost all smartphones have an FM receiver chip built into their hardware. It's actually the same chip that is used for WiFi and Bluetooth functionality. In the iPhone 6, it's the Murata 339S0228, and the FM utility is completely switched off. According to the NAB, the FM chip could be an invaluable feature for the public to utilize in an emergency situation, especially considering how cellular and data networks can become overloaded in the case of an emergency.