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Wi-Fi and mobile data
Free Wi-Fi is common in cafés, the subway, and public places; SIMs and eSIMs are sold at the airport.
Most cafés print the Wi-Fi password on the receipt or post it on the wall.
Seoul and other major cities run free public Wi-Fi on streets, in parks, and on buses.
Tourist SIMs and eSIMs are sold on airport arrival floors, in convenience stores, and online. An eSIM bought online before departure works right on arrival.
On public Wi-Fi, it is safer to avoid sensitive tasks like banking.