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Honestly? i don't know. i suspect that a great deal of them probably are shielded. South Korea (ROK) is a pretty modern and well off nation. Their economy is doing well, and they did lots of good business with China.

i have never served in Korea. i do know something about their nation. If the DPRK comes south this time, they are going to have a very difficult time of it. If "the balloon goes up", i don't think that they will be bitching too much about their civillian commo systems. They will be too busy welcoming US reinforcements, Japaneese reinforcements, and Austrailian reinforcements, preparing to "kick ass and take names".

i honestly think that they would rather have their commo disrupted than have Seoul disrupted by a nuke, or a bunch of chemical warheads.

I've been there a few times, both for business and pleasure.
(hoping to get to go again soon )

The model of walkie-talkie used by the police and most government types are not shielded.
Most consumer items, although feature advanced, seem to be constructed as inexpensively as possible.
EVERYONE has a cellphone. Broadband penetration is MUCH greater then in the States.

The urban areas are densely populated, with multiple layers of highway overpasses, underground shopping malls, subways and elevated trains- an artillary barrage of any duration would cause massive, long-lasting disruption of civilian life.

Although the North has no love for the Japanese or the US, I think their desire to re-unite with ( take-over ) the South would keep them from using any nukes or chemicals there.