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Rhapsody is also available for the iPhone and BlackBerry. Offline playback functionality is already available on Rhapsody's iPhone app.
The subscription-based service offers a catalog of more than 10 million songs for a monthly fee of $9.99 or $14.99 if you want support for more than one mobile device. Rhapsody's biggest competitors, Spotify and Napster, already have offline playback functionality on mobile devices. However, Spotify is currently only available in Europe.