A rádio foi o primeiro meio móvel, mas deixou de ser o único

«In the realm of instantaneous communication, radio is the first and premier mobile medium (in terms of time spent listening). From a functional standpoint, radio has its greatest appeal to unwired listeners who are traveling from place to place. (...)The mobile functions of radio are no longer unique, however, as competing devices lave arrived. First, iPods threaten the music entertainment function. Second, the Internet (which itself has become a mobile medium) usurps the information function. Finally, the cell phone is now the new personal companion, which offers nearly everyone real-time access to friends and built-in iPod or WiFi functionality. (...)I Radio may have a bright future, but it will have to fend off other devices that serve to link people to audio messages.»