I have only successfully used Lync voice once on a United flight.

It has failed on other attempts -- but I'm not clear if this is because they started blocking it or if there was insufficient bandwidth.

But to the other comments -- United WiFi is so unreliable (you might think you have it until you take off only to discover that it never actually connects to the satellite) that I would never depend on it for a critical call.

I do generally agree with the need to limit the people to have voice calls on planes, but as someone who spends the majority of his life on conference calls (primarily listening), it would be nice to be able to dial-in and *listen only* -- while recognizing the impossibility of actually making that possible and enforcing that.