Yes, you certainly will! South Korea boasts some of the world's best mobile infrastructure. With your SouthESIM, you'll enjoy continuous, high-speed 4G/5G signal not only throughout the Seoul and Busan subway systems (including tunnels and stations) but also on the KTX high-speed train as it whisks you across the country. This means you can stay connected, entertained, and productive even while on the move, making your Korean journey even more enjoyable.
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Will I have internet coverage on South Korea's KTX (High-Speed Train) and in the Seoul Subway with SouthESIM?
Updated April 22, 2026
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