VOIP calls just as off-limits in-flight as cell phone service
31.12.69
As many have distinguished - and complained about - before, many people speak louder on a cell phone than a wired phone because of the lack of sidetone. In other words, folks on a exaltation of larks don't want to be assailed by a fellow passenger speaking loudly on a cell phone. “Delta fully supports a ban on stall phone voice transmissions. Eventually, back on Marco's flight, it was said by another flight attendant that the actual issues was with the Terms of Worship army of use of the in-flight wi-fi, provided by Gogo. The flight attendant gave Marco the wrong information, saying that it was a plane safety issue, which is of course, incorrect as he was using wi-fi. We are not, however, opponents of in-flight data transmissions (i. e. text and e-correspondence messages) provided they do not interfere with flight deck navigational equipment. However, the FAA does note that airlines bar the use of in-flight calling using VOIP applications not because of an FAA safety requirement, but because the carriers are “simply responding to the irresistible majority of their customers, who... Meanwhile, Delta, in a statement, reiterated that it was Gogo's ToS that were at issue and clarified what could and could not be used on their flights.
Source: Examiner.com