For travelers, the local data sim card is very important for using Maps, Hotel booking, Googling and keeping in touch with friends. Specially in South Korea where the public transportation is very modern, most of the local subways, buses, express train are updated on Google maps in latin letter, plus, the 4G/LTE in Korea is very fast even in rural area. I've been in a very nice and peaceful village without any tourist with just with my phone. Buy a Sim card in advance and enjoy your trip like a local.
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