FlyTunes, which operates a mobile radio network for the iPhone and iPod Touch, has upgraded its service with video and audio podcasts, a customizable channel guide, a new user interface and 200 additional channels. The network now has more than 350 music, talk, video and podcast channels.

The new interface is designed to make it easier to find channels, and the channel displays include more detailed information including text-message links. There's also a MyGuide feature that lets users program the selection list to only display favorite channels or genres.

FlyTunes is a free service. Sign up is at www.FlyTunes.fm.