I don't think the Symbian OS has any required/direct support whatsoever in regards to DVB in any way or form (i.e., you'd have to write it yourself, assuming you already have suitable DVB hardware).
Nokia is using the Series 90 phone 7700 with a DVB-H module for developing and testing DVB-H (IP datacasting) services.
yeah, there is definitely no support. It might be interesting to try to write DVB-H stuff, but it would be hell of the work...:-(
And of course there is a question how the device's hardware would handle this...