This is one of the most controversial tech subjects I know of. VoIP on airplanes. A recent survey in the APAC region shows that 42 percent of the travelers there would like to see VoIP calling allowed in-flight. That's 2 out of every five traveler who want to be able to make a call from the air.
As someone old enough to remember when Airfone was found in the seatbacks of domestic airplanes here in the USA I really don't see what the hubbub is all about. As long as people use what is known as "public voice" and keep their sound levels to a quiet conversational tone, voice calling isn't such a bad idea to see come back.
What's more I'd be happy to see some restrictions like no calling on a night flight or red eye after 11 PM. of the destination or limit calls to 3 minutes or less and no repeat calling the same number more than once in an hour. Let's face it, with text and email we've already proved we can cut down phone calls and get the same message across with text and attachments..