When you land in Korea, you’ll want mobile data before you look for the train. You can buy it from a Korean carrier (SK Telecom, KT or LG Uplus) or from an eSIM app that sells data on a Korean network.[1][4][5][9][10]
For three days, the main data eSIMs from all three carriers cost KRW 18,000 (about US$13), so price barely separates them.[1][4][5] What matters is whether you need a Korean phone number, and whether you want to stop at an airport counter to get one. The prices, plans and counter hours in this guide come from the carriers’ and the apps’ official English pages and Incheon Airport’s facility list, as of October 11, 2026 (how we research). We recommend one option for each kind of trip and say why (how we recommend). This guide has no paid links.
Which eSIM fits your trip depends on whether you need a Korean number
Find the row that sounds most like your trip. Before you buy any eSIM, check that your phone supports eSIM and isn’t locked to one carrier (see the eSIM section below).
| Your trip | Data use | Korean number | Korean ID check | Our pick | Why |
|---|---|---|---|---|---|
| 1. A few days, mostly maps and messaging | Light | Not needed | Not needed | SK Telecom eSIM, bought online | Data works without a passport check or a counter visit. 2 days cost KRW 12,000 (about US$8.90), and a 1-day data pass KRW 6,500 (about US$4.80).[1][2][12] |
| 2. A week or more, with video calls or streaming | Heavy | Not needed | Not needed | SK Telecom LTE eSIM | SK Telecom says its LTE eSIM data runs at up to 100 Mbps with no data cap. KT’s data eSIM drops to 5 Mbps after 11 GB in a day.[4][12] |
| 3. A hotel, tour guide or friend needs to call or text you | Any | Needed | Not needed | SK Telecom eSIM, then the online passport check | After you clear immigration, you verify your passport through the QR code in your email voucher, between 8 a.m. and 10 p.m., so you can skip the counter. Incoming calls and texts are free.[12] |
| 4. You want to sign up for restaurant waitlist or taxi apps | Any | Needed | Not needed | LG Uplus Korea Tour Pass with voice and texts (not the data-only version) | LG Uplus says lines with voice and text service can receive the text codes that restaurant and taxi booking apps send; data-only lines can’t. It also includes a bus and subway pass. You pick it up at an airport counter.[5] |
| 5. You need Korean banking or government services that ask for a Korean ID check | Any | Needed | Needed | No tourist SIM or eSIM | KT and LG Uplus say their tourist lines don’t support this check, and SK Telecom says its eSIM can’t receive the texts these checks send.[3][5][12] |
| 6. Korea plus other countries on the same trip | Any | Not needed | Not needed | An eSIM app with a regional plan | KT says its SIM and eSIM work only in Korea. Airalo sells regional and global eSIMs that include Korea.[3][4][9] |
| 7. Your phone has no eSIM but isn’t carrier-locked | Any | Optional | Not needed | KT physical SIM, collected at the airport | You reserve online and pick it up with your passport at a KT counter. 3 days of data cost KRW 18,000 (about US$13).[3] |
| 8. Several people or devices sharing one connection, or your phone is locked | Shared | Not needed | Not needed | A pocket Wi-Fi router | One router serves several devices. SK Telecom rents one for KRW 3,300 (about US$2.40) a day when you book online.[2] |
A bus and subway pass in a data bundle won’t always match your plans, so compare it with our Seoul transit card guide before you pick row 4 for that reason alone.
Korean carrier eSIM vs eSIM app: what you pay and what you get
This table sets three carrier eSIMs beside two eSIM apps that sell Korea plans and publish them on official English pages.
| SK Telecom LTE eSIM | KT data eSIM | LG Uplus Korea Tour Pass eSIM (LTE) | Airalo | Holafly | |
|---|---|---|---|---|---|
| 3 days | KRW 18,000 (about US$13)[1] | KRW 18,000 (about US$13)[4] | KRW 18,000 (about US$13)[5] | Check Airalo’s page | Check Holafly’s page |
| 5 days | KRW 27,500 (about US$20)[1] | KRW 27,500 (about US$20)[4] | KRW 27,500 (about US$20)[5] | Check Airalo’s page | Check Holafly’s page |
| 7 days | KRW 35,000 (about US$26)[1] | KRW 35,000 (about US$26)[4] | Not sold as a 7-day plan on this page[5] | Check Airalo’s page | Check Holafly’s page |
| Data | Unlimited, up to 100 Mbps[12] | 11 GB a day at full speed, then up to 5 Mbps[4] | Unlimited with no speed cap, though speeds may be managed when the network is congested[5] | Packages for 3 to 30 days; check the data amount on the page[9] | Unlimited[10] |
| Korean number | Yes: incoming calls and texts free after a passport check; outgoing needs a top-up[12] | Incoming calls and texts free after an entry check at a KT airport counter; no outgoing[4] | Yes, a 010 number[5] | Not shown on its Korea page[9] | No Korean number: it’s data only, and its FAQ says to use your own SIM for calls and texts[10] |
| Airport counter | Not needed[12] | Only to turn on the number[4] | Needed to pick it up[5] | Not needed[9] | Not needed[10] |
| Refund | None after you scan the QR code, unless your phone is locked or doesn’t support eSIM[12] | None once you’ve bought it[4] | Check LG Uplus’s page | Check Airalo’s terms | In full if not yet activated, within 6 months of purchase[11] |
| Network | SK Telecom[1] | KT[4] | LG Uplus[5] | SK Telecom[9] | SK Telecom, LG Uplus[10] |
KT also lists a “Data & Travel” plan at KRW 16,200 (about US$12) for 3 days, with unlimited data, a free transport card and calls by top-up only.[3][4] KT sells eSIMs with call credit only at its airport counters, so check whether this plan is sold online on the day you buy.[4]
Prices and terms in this table are as of October 11, 2026.[1][4][5][9][10][11][12] Airalo and Holafly show prices in US dollars or euros rather than won, so we haven’t put their prices in this table. Check the price in your own currency on their pages before you compare. Apps can also change which Korean network they use, so check the network listed on the day you buy.
Our pick if your phone supports eSIM and Korea is your only stop: SK Telecom’s eSIM
We recommend SK Telecom’s LTE eSIM, bought from its own website, if your phone supports eSIM and Korea is your only stop. Here’s why:
- It costs the same as KT’s data eSIM, with no data cap. For 3, 5 and 7 days, both cost KRW 18,000 (about US$13), KRW 27,500 (about US$20) and KRW 35,000 (about US$26). KT’s slows to 5 Mbps after 11 GB in a day; SK Telecom says its LTE eSIM has no data cap.[1][4][12]
- You don’t need a counter, even for the number. Data works before the passport check. After you clear immigration, you can do the check online through the QR code in your email voucher, between 8 a.m. and 10 p.m., to turn on free incoming calls and texts.[12] KT’s number needs a visit to a KT counter at the airport.[4]
- It comes with extras for longer plans. SK Telecom says its LTE eSIM plans of 3 days or more include a free T-money transit card and a Royal Palace Pass for 12 sites, including Gyeongbokgung Palace. You must register the pass in the app and use it by December 31, 2026.[12]
Choose something else if:
- you need sign-up codes from restaurant or taxi apps (row 4): the LG Uplus Korea Tour Pass with voice and texts;
- you’ll pass a KT counter anyway and want a lower carrier price for 3 days: KT’s Data & Travel plan, KRW 16,200 (about US$12);[3][4]
- you’re visiting other countries on the same trip (row 6): an eSIM app with a regional plan;
- your phone can’t use eSIM (rows 7 and 8): a KT physical SIM or a pocket Wi-Fi router.
If you want data only and an app is cheaper in your currency for your dates, that’s a fair choice too. Read its refund terms first: Holafly, for example, refunds a change of plans in full only if you haven’t activated the eSIM.[11]
A passport check stands between you and a Korean number
Korean law requires mobile carriers named by presidential decree to confirm the identity of the person they sign a service contract with, and lets them ask for an ID document.[7] SK Telecom and KT say they do this for tourist lines with a passport check.[3][12]
- SK Telecom says incoming calls and texts start working only after your passport details are verified. After you clear immigration, you can do this online through the QR code in your email voucher between 8 a.m. and 10 p.m.; outside those hours, you do it at an airport roaming center with your passport. Outgoing calls and texts need extra credit on top.[12]
- KT says voice and text services work only after an identity check, which it calls an entry check, at a KT roaming center in the airport.[3][4]
- LG Uplus asks for your passport details and a photo when you buy the Korea Tour Pass.[5]
With SK Telecom’s eSIM and KT’s data eSIM, data works without any of this. What the check turns on is the phone number.[4][12]
The check has limits. KT and LG Uplus say their tourist lines don’t support personal authentication, the Korean ID check that many local banking and government services use, and SK Telecom says its eSIM can’t receive the texts these checks send.[3][5][12] SK Telecom verifies one product per passport at a time, and KT one contract number per passport.[4][12] Both carriers design these lines for visits of up to 90 days.[3][12]
An eSIM is quick to install and hard to undo
An eSIM is a digital SIM that you install by scanning a QR code, so there’s no card to swap. All three carriers sell tourist eSIMs.[1][4][5]
To find out whether your phone supports eSIM, dial *#06#. If an EID number appears (it usually starts with 89), your phone most likely supports eSIM.[1] Your phone also must not be locked to one carrier or country.[1][4][5]
Three rules catch people out:
- Scan only when your trip is certain. Once you scan SK Telecom’s QR code, you can’t move the eSIM to another phone or get a refund, unless your phone turns out to be locked or doesn’t support eSIM.[12] KT doesn’t refund an eSIM once you’ve bought it.[4]
- Don’t delete it. KT says you can install its eSIM only once. If you delete it, you get no new QR code and you have to buy a new plan.[4] SK Telecom also says a deleted eSIM can’t be used again.[12]
- Know when the clock starts. LG Uplus counts your days from the first time you use data.[5] Holafly says its plan begins when you arrive and turn on the eSIM.[10]
A physical SIM suits older phones, and a router suits groups
A physical SIM card works like the eSIM, but you pick it up at the airport and put it in your phone yourself. KT asks you to reserve and pay in advance, then collect the SIM at a KT roaming center at your arrival airport, with your passport.[3] Choose a physical SIM if your phone can’t use eSIM but isn’t locked to a carrier.
KT’s SIM gives 11 GB of full-speed data a day. After that, you can keep using data at up to 5 Mbps until the allowance resets at midnight.[3] It’s valid for up to 90 days.[3]
A pocket Wi-Fi router is a small battery-powered box that shares one data connection with several devices. SK Telecom rents its T Wi-Fi Router for KRW 4,400 (about US$3.30) a day, or KRW 3,300 (about US$2.40) a day if you book online.[2] You pick it up and return it at a rental booth.[2] That makes sense for a family or group sharing one connection, or if your phone is locked. The downsides are an extra device to charge and a booth visit before you fly home.
The airport counters decide when you can arrive
If your plan needs a counter visit, check the opening hours against your arrival time. Incheon Airport lists these roaming centers in Terminal 1:[6]
| Carrier | Where (Terminal 1) | Hours |
|---|---|---|
| KT, LG Uplus, SK Telecom | 1st floor, near Arrival Hall F | 24 hours |
| KT, LG Uplus, SK Telecom | 1st floor, near Arrival Hall A | 06:00–22:00 |
| SK Telecom, KT | 3rd floor, near Departure Hall 4 | SK Telecom 06:00–22:00, KT 06:00–14:00 |
| LG Uplus, KT | 3rd floor, near Departure Hall 3 | 06:00–22:00 |
In Terminal 2, LG Uplus lists a 24-hour counter at Gate 3 and another at Gate 8 open 06:00–22:00, both in the 1st-floor arrival hall.[8] If you land late at night at a terminal where your carrier has no 24-hour desk, choose an SK Telecom eSIM or a KT data eSIM, which you can install without a counter visit.[4][12]
Good to know
Before you fly:
- Dial
*#06#to check for an EID, and ask your home carrier whether your phone has a country lock.[1][4] - Find your row in the table at the top and buy from the carrier’s or the app’s own page.
- Compare your home carrier’s roaming price with the options above.
- Bring a credit or debit card issued outside Korea.[3][4]
- Match your arrival time to an open counter if your plan needs one.[6][8]
- Keep your home SIM card somewhere safe if you swap it out.
Prices and plans change. Check the seller’s page on the day you buy.
Next, pick a way into the city with our AREX train guide. More for your first day is in Arriving in Seoul. See how we’re funded.
