Net neutrality advocates questioned the Mobile Future study's results.

One of the major backers of Mobile Future is broadband provider AT&T, one of the most vocal opponents of net neutrality rules, said Andrew Jay Schwartzman, senior vice president and policy director of the Media Access Project, a media reform advocacy group.

"Judging by the press release, Coleman Bazelon has delivered a predictable outcome," Schwartzman said.

The study ignores large telecom profits in recent years, when AT&T was required by federal regulators to accept net neutrality rules as part of its merger with BellSouth, said Derek Turner, research director with Free Press, also a media reform group.

"This industry-funded research is based on deeply flawed assumptions, and amount to nothing more than anti-net neutrality propaganda," he said.