QUOTE (FutureUScapt @ Feb 4 2009, 05:57 PM)

Actually cell phone and voice over the internet protocol (VOIP) are not permitted on AA's gogo inflight wifi (thank goodness!); I would assume that any other carriers would have the same restrictions.
AA Inflight WifiThat page says they are not supported. It does not say they are prohibited.
They likely block the big VoIP provider addresses and the standard ports. I could (and did this, when Boeing still had connexion) simply jam the session thru a VPN tunnel and get it anyway.
That said, doing either sucks on the airplane. The latent nature of the connection to the plane makes using the connection (VPN or otherwise) for VoIP all but impossible. If it's usable at all, it will sound like a really bad CB radio.
Saving the world, one clue at a time.