eSIM for South Korea: data, maps and apps that actually work
What mobile data costs in South Korea, why Google Maps won't get you around Seoul on foot, whether you need a Korean number for Kakao T, and how to pair Korea with Japan on one eSIM.
· 6 min read
A travel eSIM is the easiest way to be online in South Korea: buy a prepaid data plan before you fly, install it at home, and switch it on when you land at Incheon. Korea has some of the fastest, most complete mobile coverage in the world, including 5G across the cities and signal deep in the subway. Cabin Mode sells South Korea plans from 1 GB to 50 GB, and the main thing to plan around isn't coverage but which apps to use once you're there.
What South Korea data costs
| Data | Valid for | Price (USD) | Per GB |
|---|---|---|---|
| 1 GB | 7 days | $1.40 | $1.40 |
| 3 GB | 15 days | $3.40 | $1.13 |
| 5 GB | 30 days | $5.40 | $1.08 |
| 10 GB | 30 days | $9.40 | $0.94 |
| 20 GB | 30 days | $16.40 | $0.82 |
| 50 GB | 30 days | $34.00 | $0.68 |
Prices checked 25 September 2026; the app shows current prices in your currency. See every South Korea plan.
Most of these start when your phone first connects to a Korean network, so you can install a few days early. The plan screen in the app says which rule a plan follows.
How much data for Korea
Korea is a heavy-data country, partly because the networks are fast enough that nothing makes you wait. Seoul trips involve a lot of subway navigation, café hopping, shopping research and short-form video.
- Light (maps, messages): 3 GB for a week
- Typical (plus social media, Papago translation, ride-hailing): 5–10 GB for a week, 10–20 GB for two weeks
- Heavy (streaming, video calls, hotspotting a laptop): 20 GB to 50 GB
Fast networks make it easy to burn through data without noticing. A few hours of HD video on the KTX to Busan can use several GB, so if that's your plan, size up. The general numbers are in how much data do I need for a trip.
There's no unlimited data plan for South Korea in the catalog at the moment; the 50 GB plan at $0.68 per GB is the heavy-user option.
Coverage
Korea's three networks cover practically everywhere people go:
- Seoul, Busan, Incheon, Daegu and Gwangju: dense 5G, and full signal on subway platforms and in trains between stations.
- KTX and intercity buses: covered along the whole route, including most tunnels.
- Jeju Island: good coverage around the coast and in towns; thinner on the upper trails of Hallasan.
- National parks like Seoraksan and Bukhansan: signal on most main trails, with gaps in deep valleys.
This is one country where you rarely need offline maps for coverage reasons. You may want them anyway, because of the next section.
Maps: why Google Maps isn't enough
Google Maps in South Korea shows transit routes, but it still doesn't give proper walking or driving directions, a long-standing result of Korean restrictions on exporting detailed map data. The government approved a conditional export deal in early 2026, but as of mid-2026 full directions had not launched.
What to install before you go:
- Naver Map: the one most visitors settle on. It has an English interface (switch it in settings), accurate walking directions, and tells you which subway exit to use and which carriage to board for a quick transfer.
- KakaoMap: good for taxis and location sharing; English support has improved but is less complete than Naver's.
- Google Maps: still useful for searching in English and reading reviews.
These apps are why a data plan matters more in Korea than the coverage numbers suggest. You'll have a map open most of the day.
Do you need a Korean phone number?
For most visitors, no. Cabin Mode is data only, so you won't get a Korean number, and here's how that plays out:
- Kakao T (taxis) lets you sign up with an overseas number, and you can set it up before you leave home. International cards are sometimes rejected for automatic payment; the fallback is paying the driver directly. Kakao Mobility also runs a separate app aimed at foreign visitors, K-Ride.
- KakaoTalk accepts foreign numbers. Kakao Pay transfers and simple payments, on the other hand, need a Korean number and residence registration, so plan to pay by card.
- WhatsApp and iMessage keep working on your usual number, because your home SIM stays in the phone.
- Some Korean websites ask for identity verification tied to a Korean phone number. Services aimed at tourists, such as rail booking sites and big attractions, usually have an English booking path that doesn't.
Keep your home line on for calls and texts (with data roaming off for it) so sign-up codes still reach you.
Local SIM, eSIM or pocket Wi-Fi
Korea has a long tradition of airport pocket Wi-Fi rental and local tourist SIM cards, both collected at Incheon arrivals. They work, but you have to find the counter, show your passport, and for pocket Wi-Fi, return it on the way out and charge it every night.
A travel eSIM needs none of that. It's installed before you leave, it's in your phone rather than a second device, and it doesn't get separated from you when your group splits up in Myeongdong. Pocket Wi-Fi still makes sense for a family sharing one connection. The comparison is in travel eSIM vs roaming vs a local SIM.
Landing at Incheon
Install at home on wifi, using how to install an eSIM on iPhone. On arrival:
- Set mobile data to the Cabin Mode line in Settings › Cellular (Mobile Service in some regions).
- Turn on data roaming for that line only.
- Leave data roaming off for your home line.
Incheon's free wifi is good if you need to sort anything out, but with the eSIM already installed you can check the AREX train times or book a Kakao T taxi from the baggage hall.
Korea with Japan or China
Korea and Japan are often done together, a short flight or an overnight ferry apart. One eSIM can cover both:
- Japan and South Korea: 5 GB for 30 days is $13.00, 10 GB is $25.60. See the plan.
- China mainland, Japan and South Korea: 10 GB for 30 days is $30.40. See the plan.
Regional plans cost more per GB than Korea on its own, so if the Japan leg is short, two separate country plans can work out cheaper. Our Japan eSIM guide and China eSIM guide cover the other halves of those trips.
Top-ups
If you run low, a top-up adds data to the same eSIM without reinstalling. Usage in the app lags one to three hours, so top up before you're down to the last few hundred MB. If you're staying a month and like the line, eligible 30-day plans can be switched to an optional monthly plan that tops up the same line each month; you can cancel it in the app.
Frequently asked questions
Is 10 GB enough for two weeks in South Korea?
For most people, yes. Maps, messaging, Papago and social media come to around 5–10 GB over two weeks. If you stream video on trains or post a lot of reels, take 20 GB.
Does Google Maps work in South Korea?
Partly. It shows transit routes and places, but not proper walking or driving directions. Install Naver Map or KakaoMap before you go and use Google Maps for searching and reviews.
Can I use Kakao T without a Korean phone number?
Yes. Kakao T accepts overseas numbers at sign-up. If your foreign card is declined for automatic payment, choose to pay the driver directly.
Do I need a SIM card for South Korea?
No. A travel eSIM gives you mobile data without a local SIM card or pocket Wi-Fi, and your home SIM stays in your phone for calls and texts. You need an iPhone XR or later that is carrier-unlocked.
Does the eSIM work on the Seoul subway?
Yes. Korean networks cover subway platforms and tunnels, so you'll have signal for most of your journey.
Can I use one eSIM for Japan and South Korea?
Yes. The Japan and South Korea regional plan covers both countries on one eSIM, so there's nothing to switch at the border.