Yes. South Korea has the best mobile infrastructure in the world. You will have a continuous, high-speed 4G/5G signal inside the Seoul/Busan subway (stations and tunnels) and on the KTX (high-speed train) as it travels between cities, allowing you to stream video or browse without interruption.
HELP CENTER
Is there internet/WiFi on KTX and Seoul Subway?
Updated April 22, 2026
Was this answer helpful?
Related questions
Other answers in this topic that travelers found useful.
eSIM in Mauritius: Easier than a local SIM at MRU Airport?
Yes, 100%. Buying a physical local SIM card (from Emtel or My.t) at Sir Seewoosagur Ramgoolam (MRU) Airport requires you to find the kiosk, …
Read answerDoes Unitel Laos eSIM work? Which networks are supported?
Coverage is everything in a mountainous country like Laos. Our eSIM connects to the country’s most reliable providers, usually Unitel …
Read answerDoes Uber work in Armenia? Can I book Yandex Go at the airport?
Yes. Unlike traditional SIMs that require queuing at the kiosk in Zvartnots Airport, an eSIM activates instantly. This is crucial in A…
Read answerDoes a France eSIM work in other EU countries like Spain or Italy?
This specific plan is valid only within France . This is crucial if you are on a European tour. If you take the Eurostar to London (UK…
Read answerIs roaming free in Benin?
No, absolutely not. Although Benin is a French-speaking country, it is NOT part of the EU or any French domestic plan. Most home carriers (l…
Read answer