The USB ports if they are the ones for watching Videos, Photos, and Music as well they really can't access the iPhone as they are looking for a Thumb Drive. Most Media Players attached to a TV are basic and will play Dvix, Xvid and some Mp4s.

Lastly most of the USB ports are for Firmware Updates so check for that as well......

If your tv has a usb port then it might be possible. If not, there is a cable that connects with the audio jack that allows you to conect to the little red, white, and yellow connectors. Even so it probably isnt a giid idea to watch videos from your iphone or ipod since the resolution isnt meant for a tv (bigger screen).