Digital music startup, FlyTunes, is set to launch a service that will allow users to play internet radio for free on their iPhones and other portable devices. The music service, which will work on an ad-supported basis, lets users create personalised music channels with tracks taken from over 20,000 internet radio stations. It also promises to give uninterrupted service by caching hours of music that can be listened to when there is no connection available. (PR)