Free eSIM for South Korea: 1 GB, and a Map App That Works
co:sim TeamSouth Korea is the one country where arriving without data is genuinely disabling, because the map app you already have on your phone does not work properly here. co:sim's free new-user eSIM for South Korea is 1 GB valid for 7 days, $0 at checkout, installed before you fly and live the moment you land at Incheon, Gimpo, Gimhae or Jeju.
This guide covers the Google Maps problem and what actually changed in 2026, which Korean networks carry the eSIM, whether 1 GB survives a week in Seoul, and how to install it before departure.
#Why does arriving offline hurt more in South Korea?
Because Google Maps still cannot give you turn-by-turn driving navigation inside the country, and its walking directions are thin. Public transit routing works. Everything else you have to do in Naver Map or KakaoMap, both of which need a live data connection to be worth anything.
This is the part most travellers get wrong, and it is worth being precise about it, because the situation genuinely changed recently. For nearly two decades Korea refused to let Google export the detailed 1:5,000-scale mapping data its navigation depends on, citing national security. In February 2026 an interagency review body approved the export under strict conditions, ending a 19-year dispute — Google must process raw data on domestic servers via a local partner, obtain clearance before any transfer, and blur sensitive sites.
That was regulatory clearance, not a launch. As of reporting in late August 2026, turn-by-turn navigation was still described as coming rather than shipped. Plan your trip on the assumption it is not there, and treat any improvement you find as a bonus.
So the practical sequence on arrival is: get online, install or open Naver Map, then move. A co:sim eSIM installed at home collapses that to one step, because you are already online when the aircraft door opens.
#Which Korean networks will carry it?
co:sim's South Korea plans roam onto SK Telecom and LG U+, both on 5G. Each plan page lists the underlying network before you buy, which is the honest way to compare eSIMs — the network decides the experience far more than the branding on the plan does.
Korea is, by the numbers, close to the best mobile market on earth. Opensignal's December 2025 South Korea report measured average download speeds of 189.3 Mbps on SK Telecom, 154.3 Mbps on KT and 142.9 Mbps on LG U+, with LG U+ winning 5G Availability at 90.3% — the proportion of time a 5G handset actually has a 5G connection available.
Put that 90.3% beside Japan, where the leading network manages 27.4% on the equivalent measure, and the gap is the whole story. In Seoul and Busan you will have 5G essentially all the time, including in subway tunnels and along the KTX line. The places it thins are mountain trails: Hallasan on Jeju and the Seoraksan ridges, not the transport network.
#Is 1 GB enough for a week in South Korea?
For navigation, messaging and translation, yes. For video, no. Naver Map with live transit routing uses roughly the same data as Google Maps — single-digit megabytes per hour of active use. Papago's camera translation on a menu is a few megabytes a session. A careful traveller spends 80–150 MB a day, which fits a week inside 1 GB.
The trap in Korea specifically is that fast networks encourage expensive habits. On a 190 Mbps connection, a video autoplays instantly and a photo backup finishes before you notice it started. One 10-minute 1080p clip is around 300 MB, roughly a third of the allowance. Switch off photo auto-backup on cellular before you land.
If you run out, these plans are reloadable: you top up from the co:sim account dashboard and the same eSIM profile keeps working, with no reinstall and no new QR code.
FREEClaim the free eSIM for South Korea#Why not just buy a tourist SIM at Incheon?
For a longer trip you probably should, and the counters are easy to find in the arrivals hall. KT and SK Telecom tourist SIMs run roughly ₩27,500–38,500 for five to ten days of unlimited data, which is far more than 1 GB, and if you plan to stream or tether a laptop that is the right purchase.
Two things still argue for claiming the free eSIM as well. The first is that Korea has required real-name registration on prepaid mobile since 2012, so the counter records your passport before the number activates — a queue and a document check between you and your first Naver Map search.
The second is the AREX. If you take the all-stop airport train, you are looking at about 59 minutes to Seoul Station for ₩4,450; the non-stop Express does it in 43 for ₩11,000. That is the window in which you want to be checking which exit your accommodation is near, not standing in line to buy the ability to check.
#How do you claim and install it before you fly?
Install at home on Wi-Fi, activate on arrival. That order matters more here than usual, because installing an eSIM needs an internet connection and getting online in Korea is the thing you are trying to solve.
- Open the free eSIM page for South Korea and claim it. One per new customer, $0 at checkout.
- co:sim emails the QR code within seconds of checkout.
- Scan it on home Wi-Fi. iPhone:
Settings → Cellular → Add eSIM. Most Android:Settings → Network & internet → SIMs → Add eSIM. - Download Naver Map or KakaoMap in the same sitting, while you still have Wi-Fi.
- On landing, switch the co:sim line on and enable data roaming for that line only.
Each co:sim plan page states its install deadline, so you can see how far ahead of a trip it is safe to buy rather than guessing.
Adding Tokyo or Osaka to the same trip? South Korea and Japan do not share a card here, but a Japan & South Korea regional plan covers both countries on one profile.
#FAQ
#Is the free eSIM for South Korea the same offer as co:sim's free eSIM for Europe?
No. co:sim's new-user free eSIM is one promotion funded across several genuinely separate products, and they are different cards. One is a regional plan covering 33 European countries on a single profile. The South Korea version is its own single-territory plan: it works throughout South Korea and nowhere else, with no roaming to Japan even on the Busan–Fukuoka ferry. Turkey, Moldova, Singapore, Malaysia, Indonesia, Japan and Thailand each have their own separate card on the same basis. The promotion is claimable once per new customer, so this is a choice between countries rather than a set to collect. Take it for wherever you land first, or wherever you will spend the most days without other connectivity arranged. If Seoul is the start of a wider East Asia trip, that usually means claiming it here.
#Does Google Maps really not work in South Korea?
Largely, and it surprises people every week. Inside South Korea, Google Maps provides no turn-by-turn driving navigation and only limited walking directions; public transit routing does work, so you can still plan a subway trip with it. The cause was a long-standing restriction on exporting detailed Korean mapping data abroad. In February 2026 the Korean government approved Google's export request under security conditions, ending a 19-year dispute, but that approval was regulatory clearance rather than a product launch, and full navigation had not appeared as of late August 2026. Plan around Naver Map or KakaoMap, and download whichever you choose before you fly. Both need a live data connection to route you anywhere, which is the practical reason to arrive with one already working rather than hunting for airport Wi-Fi with a suitcase.
#Does it work in the Seoul subway and on the KTX?
Yes, and this is where Korea's network quality shows. Mobile coverage runs through subway tunnels rather than stopping at the platform edge, so a map keeps updating between stations, and the KTX line between Seoul and Busan is covered along its length. Opensignal measured 5G availability at 90.3% for the leading Korean operator, meaning a 5G handset has 5G available the overwhelming majority of the time. Because a co:sim eSIM roams onto the same national networks Korean subscribers use rather than a separate tourist network, you get what a local phone gets in the same carriage. The genuine gaps are hiking trails, notably Hallasan on Jeju and the higher Seoraksan ridges, where you should download offline maps before setting out rather than relying on any provider.
#What happens when the 1 GB or the 7 days run out?
Whichever you reach first ends the plan's data. The seven days start at first connection rather than at purchase, so installing the profile a fortnight before departure does not quietly consume the validity — the clock begins when the eSIM first attaches to a Korean network. Once the allowance is gone, these plans are reloadable: top up from the co:sim dashboard and the same profile carries on working without a reinstall or a new QR code. You can also move to a paid South Korea plan with a bigger allowance, or buy a counter SIM if you are still near an airport. Nothing on the phone breaks when the free plan ends; the line simply stops carrying data until you top it up.
#Do I need to remove my normal SIM, and can I tether?
You do not. Any eSIM-capable phone from the last several years holds several profiles at once and lets you choose which one carries mobile data, so your home SIM stays installed and keeps receiving calls and texts on your usual number. Set the co:sim line as the data line and leave roaming off on the home line so it cannot bill you quietly. Tethering works and is the usual way two people share one plan, but the shared device draws from the same 1 GB, and laptops empty it fast once cloud sync starts. For deliberate sharing, a paid South Korea plan with a larger allowance is the sensible purchase, with the free trial getting you both online at Incheon.
Ready to land connected, with a map app that actually works? Claim the free eSIM, install it tonight, and switch it on when you arrive.
Browse co:sim's South Korea eSIM plans
