In South Korea at least, Digital Multimedia Broadcasting (DMB) is built into a lot of phones and portable media devices: https://en.wikipedia.org/wiki/Digital_

In South Korea at least, Digital Multimedia Broadcasting (DMB) is built into a lot of phones and portable media devices: https://en.wikipedia.org/wiki/Digital_Multimedia_Broadcasting https://en.wikipedia.org/wiki/Digital_Multimedia_Broadcastin... But this requires special DMB signal transmission, which I doubt North Korea has. I would think the antennas would be for analog TV reception.