South Korea boasts some of the fastest mobile data speeds on the planet, and the eSIM is the only way to tap into them instantly. Forget swapping physical SIMs—an eSIM delivers reliable, high-speed 4G/5G data from top carriers like SK Telecom and KT right to your phone the moment you land.
In this ultimate 2025 guide, we compare the top eSIM providers—including Airalo, Holafly, and the budget-friendly RedteaGO—based on price, speed, network access, and crucial features like unlimited data and hotspot support.
We also answer the most important question for any long-term visitor: Do you need an eSIM with a Korean phone number to use apps like Kakao T and Naver Map?