You absolutely can! South Korea boasts one of the most advanced mobile infrastructures globally, and your EastESIM leverages this. You'll enjoy continuous, high-speed 4G/5G signal not only throughout the Seoul and Busan subway systems (both in stations and tunnels) but also while traveling on the KTX high-speed train as it zips between cities. This means you can stay connected, stream, work, or navigate without interruption, making your journeys across Korea seamless and productive.
HELP CENTER
Can I expect internet coverage with my EastESIM while traveling on the KTX high-speed train and within the Seoul Subway system?
Updated April 22, 2026
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