Korea, too. Probably some other countries. I remember the PSP had an optional OTA antenna.

There have been several attempts at doing the same thing in the U.S., but none of them ever worked out for various reasons. Often it was because of the expense of upgrading the tens of thousands of TV transmitters across the country.

This one died in 2011: https://en.wikipedia.org/wiki/MediaFLO

In a small country with more centralized control of broadcasting and less territory to cover like Japan and Korea, it's much easier.

Yup, I remember when I thought having my Motorola RAZR was the epitome of cool, people in Seoul would flip up their seemingly dumber phones and stream crystal clear HD TV in the subway.

For South Korea it's not normal HDTV but a special broadcast for mobile devices, DMB [1]. It was only recently updated to support 720p in favor of 240p. They aren't picking up the domestic ATSC signals. The Japanese mobile video system is a similar separate broadcast.

https://en.wikipedia.org/wiki/Digital_multimedia_broadcastin...