South Korea has some of the best mobile networks in the world and some of the cheapest travel data — but it also has one big surprise for first-time visitors: Google Maps does not give full directions there. That changes what you need from your connection more than any speed test.
Short answer: a travel eSIM with 5–10GB covers most one- to two-week trips. Install Naver Map or KakaoMap before you go, and buy a plan whose validity covers your whole trip.
What a South Korea eSIM costs
At the time of writing (October 2026), Wanderly's South Korea plans start at $2.99, and 10GB costs around $6–$7. The median across all data-only South Korea plans is about $0.65 per GB — among the cheapest of 187 countries in the Wanderly eSIM Price Index, where only two countries have a lower median.
Some of the cheapest bundles are valid for only a few days. For a week or more, pay the small difference for a plan that covers all your dates. Comparing with the big brands? See South Korea vs Airalo and South Korea vs Holafly.
The networks: SK Telecom and KT
South Korea's main networks are SK Telecom, KT and LG U+. Wanderly's plans connect to SK Telecom or KT, which together cover Seoul, Busan, Jeju and the high-speed rail corridors. Coverage in cities is excellent, including on the Seoul and Busan subway systems.
The Google Maps problem — and why it matters for data
Google Maps shows places in South Korea but does not provide full walking or driving directions, because of local mapping-data restrictions. Almost every visitor ends up using:
- Naver Map — the most popular, with English support and accurate transit directions
- KakaoMap — a strong alternative, also with transit directions
- Kakao T — for booking taxis
Install them and test them at home before you fly. They work over mobile data, and you will use them constantly.
Coverage where you will actually be
- Seoul: excellent 4G and 5G everywhere, including the subway and Han River parks.
- Busan: excellent in the city, Haeundae, Gwangalli and Gamcheon Culture Village.
- KTX high-speed trains: good coverage along the main lines, with short drops in tunnels.
- Jeju Island: good in Jeju City, Seogwipo and along the coast roads. Signal weakens on high trails on Hallasan, so download offline maps for hikes.
- Gyeongju and Jeonju: reliable in the towns and at the main heritage sites.
How much data you need in South Korea
| Trip | Suggested data |
|---|---|
| Seoul long weekend | 3 GB |
| One week, Seoul and Busan | 5 GB |
| Two weeks incl. Jeju | 10 GB |
| Remote work, streaming or hotspotting | 20 GB+ |
Navigation in Korea runs through Naver Map or KakaoMap, plus translation (Papago is the local favourite) and messaging. Video calls and photo backups use the most. See how much data you need for travel.
eSIM vs a Korean SIM or pocket WiFi
Airport counters at Incheon sell local SIMs and rent pocket WiFi routers. A local SIM can include a Korean phone number, which some apps and bookings ask for. Pocket WiFi suits a group staying together. For a solo traveller or couple who want data the moment they land, an eSIM installed at home is the least hassle — no queue, nothing to return.
If you need a number for verification codes, check whether the destination offers Calls & texts plans, or keep your home number active for SMS.
Combining South Korea with Japan
Compare Japan and Korea eSIM options to decide whether one shared regional allowance or two country plans better fits your dates and data needs. Visiting Japan as well? See the best eSIM for Japan.
Setting it up
- 1Confirm your phone supports eSIM and is unlocked on our compatibility checker.
- 2Install the eSIM over WiFi before you fly — iPhone or Android steps.
- 3On landing at Incheon or Gimpo, set the eSIM as your data line and turn on data roaming for that line.
- 4Keep your home SIM on for calls and texts, with its data roaming off.
FAQ
What is the best eSIM for South Korea? For most travellers, a plan with 5–10GB and validity covering the whole trip. South Korea has very cheap data, so a larger allowance costs little extra.
How much does an eSIM for South Korea cost? Wanderly South Korea plans start at $2.99, with a median of about $0.65 per GB.
Does Google Maps work in South Korea? It shows places but does not give full walking or driving directions. Use Naver Map or KakaoMap instead.
Which networks do South Korea eSIMs use? Wanderly's plans connect to SK Telecom or KT, two of South Korea's three main networks.
Does an eSIM work on the Seoul subway? Yes. Coverage on the Seoul subway is excellent, including in stations and tunnels.
Do I need a Korean phone number? Not for data. Some local apps and bookings ask for one; a Calls & texts plan or a local SIM can provide a number, while your home number stays available for SMS from home.
Adding Taiwan to the trip? See the best eSIM for Taiwan.