SAN FRANCISCO — In a spacious loft across the street from the Bay Bridge, Steve Perlman did something last week that would ordinarily bring a cellular network to its knees.

Around him was a collection of eight iPhones, a pair of television sets with superhigh-resolution 4K displays and an arsenal of other devices. Mr. Perlman played high-definition movies from Netflix on a half-dozen or so devices at once, wirelessly transmitting all the video to them. Instead of stumbling under the strain of so much data jamming the airwaves at once, the video played on all the screens with nary a stutter.

The demonstration showed off a technology that Mr. Perlman, a serial entrepreneur and inventor who sold WebTV to Microsoft for more than $500 million in the late 1990s, contends will give mobile users far faster cellular network speeds, with fewer dropped phone calls and other annoyances, even in stadiums and other places where thousands of people use mobile phones at the same time.

“This is as big a change to wireless as tubes-to-transistor was to electronics,” Mr. Perlman said recently.