SIM Cards and eSIMs
How to get mobile data in Korea — SIM cards, eSIMs, where to buy them, and how much data you will need.
SIM card or eSIM?
A local SIM card replaces your home SIM and gives you a Korean phone number and data. An eSIM is a digital SIM you install by scanning a QR code, so you keep your home SIM in your phone at the same time. Most newer phones support eSIM, and it is usually the easiest option because you can set it up before you even land.
Where to buy
You can buy SIM cards and eSIMs at the airport on arrival, where staff can help you install them. Online eSIM sellers let you buy before your trip and activate on landing. Convenience stores in the city also sell data-only SIMs, but setting them up without help can be tricky if you do not speak Korean.
How much data do you need?
For a short trip, 3 to 5 GB is usually enough for maps, messaging, and light browsing. If you watch videos or use your phone as a hotspot, choose an unlimited or larger plan. Many plans are sold by the number of days, such as 5-day or 10-day options, so match the plan to your trip length.
Free Wi-Fi as a backup
Free Wi-Fi is widely available in Seoul — in subway stations, cafes, hotels, and many public places. However, the connection can be slow or require a Korean phone number to log in, so do not rely on it alone. A local SIM or eSIM is the safest way to make sure you always have maps and translation apps available.
What to check before you travel
Make sure your phone is unlocked by your home carrier before you travel, or a Korean SIM will not work. Check that your phone supports the Korean network bands, although most modern phones do. Save your home SIM somewhere safe if you remove it, and write down any important numbers before you swap SIMs.