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.
HELP CENTER
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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