A handheld device includes an FM receiver to receive FM radio signals and a processor that is configured to monitor Radio Data System (RDS) data within FM radio broadcasts and to activate an application when a particular RDS data pattern is received. Methods for recognizing and using the RDS data to activate or initiate applications on the handheld device enable a wide range of uses and new services. A server may provide data to the handheld device in response to queries which are based on or include part of the RDS data. Operating in conjunction with FM radio broadcasters, the handheld device and the server provide a data communication system that can deliver useful services and additional entertainment options for users.