FM Backscatter Phone Display (IMAGE) University of Washington Caption The FM backscattering system encodes audio or data on top of a regular FM broadcast but uses an unoccupied frequency in the FM radio band to send that information to a smartphone or car radio receiver. Credit University of Washington Usage Restrictions with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.