eSIM vs SIM card in Korea: what visitors need to know before buying

By the Real Korea 101 editorial team · Published November 13, 2026 · Facts checked November 13, 2026

Short answer: if your phone supports eSIM and is not locked to your home carrier, a visitor eSIM from a Korean carrier is usually the easiest option: you install it with a QR code and keep your own SIM in the phone. If your phone has no eSIM, a prepaid physical SIM picked up at an airport roaming center works the same way on the network. Either way, Korean carriers sell these plans only to short-term foreign visitors (90 days or less), and a Korean phone number for calls and texts only works after passport verification.

eSIM, physical SIM or roaming: side by side

Korea's three mobile carriers, SK Telecom, KT and LG U+, all sell prepaid products for foreign visitors on their own official sites. The comparison below uses the terms SK Telecom publishes on its visitor site (skroaming.com), with LG U+ terms noted where they differ. Other sellers may package the same networks differently; we only describe what the carriers themselves publish.

Roaming prices and rules are set by your home carrier, not by any Korean source, so check them before you leave.

Before you buy: unlocked and compatible

Every carrier page we read puts the same warning near the top. SK Telecom says its visitor eSIM "is only available on eSIM-compatible phones that do not have country lock restrictions for overseas SIM use," and asks buyers to check their device before purchase. LG U+ says only country-unlocked phones that support eSIM can be used with its eSIM.

• Country lock: phones bought on contract are sometimes locked to one carrier. Ask your home carrier whether your phone is unlocked; the Korean carriers cannot unlock it for you.
• eSIM support: check your phone settings for an option to add an eSIM or mobile plan. LG U+ links a device check guide on its eSIM product page.
• Refund if it does not work: SK Telecom says a refund may be requested when the eSIM cannot be used because the phone is country-locked or does not support eSIM. Most other cases after the QR scan are non-refundable.

How a carrier visitor eSIM works

SK Telecom lists three steps for its data eSIM: buy the plan online, download the QR code from the eSIM voucher sent by email, then use the plan in Korea. Its notes add several rules worth knowing:

• Install with internet access. You need Wi-Fi or another connection to install the eSIM, so doing it at home or at your hotel is easier than at the arrival gate.
• Scan window: the QR code must be scanned within 180 days of purchase.
• One phone only: scanning is limited to one device, with up to 10 scans. Once scanned, the eSIM cannot move to another phone.
• Do not delete it: if you manually delete the eSIM profile during use, the service stops regardless of remaining days and you have to buy a new one.
• Network name: SK Telecom asks users to check that the carrier shows as "SKT" or "SKTelecom" before using the eSIM.

LG U+ says the usage period of its eSIM starts when data is first used. Its example: an eSIM with 5 days ordered on June 1 and first used at 10 a.m. on June 4 is valid until 10 a.m. on June 9. Rules on when the clock starts differ between carriers and products, so read the plan page before you install.

How a physical visitor SIM works

If your phone has no eSIM, a prepaid physical SIM is the carrier alternative. On SK Telecom's site the steps are: buy online, visit the airport roaming center, complete passport verification, then use the plan in Korea. Key terms from its SIM page:

• All SIM products are picked up at an airport roaming center, with a limit of 5 per person.
• You replace the physical SIM card in your phone, and nothing has to be returned.
• The SIM is valid for 180 days from purchase.
• It can be cancelled and refunded only on the same day and only if data, calls and texts were not used. Opened SIM packages cannot be cancelled or refunded.
• The page states that the SIM does not support NFC functionality.

Plan the pickup around your arrival time. Collection depends on roaming center opening hours, which are listed on the carrier's own site.

The Korean 010 number and passport verification

A Korean 010 number is useful for restaurant waitlists, delivery and taxi apps that send a text code. But it is only active after passport verification, and only on plans that include voice and text.

• SK Telecom: data works without passport verification. Incoming calls and texts start after verification, and outgoing calls and texts need a separate top-up. Verification is available online through the emailed voucher every day from 8:00 to 22:00, after you have cleared Korean immigration. Outside those hours, show your physical passport at an airport roaming center. One product can be verified per passport at a time.
• LG U+: plans with voice calls require you to present your passport at an airport counter. Purchase needs passport information and a photo. LG U+ says that with voice and SMS service, SMS verification for restaurant and taxi reservation apps is available, but data-only plans cannot receive SMS verification.
• KT: KT also sells visitor SIMs and eSIMs on its official roaming site (roaming.kt.com). Its pages did not load in a readable form when we checked, so we do not quote its terms here.

Enter your name exactly as it appears in your passport when you buy. A mismatch can block verification later.

What it costs

Prices change often and vary by speed, days and whether a phone number is included, so we show only two SK Telecom examples as listed on its English site on November 13, 2026:

• Outgoing calls and texts on SK Telecom voice plans are paid from a top-up: 4.4 KRW per second for domestic calls and 33 KRW per text, as listed on November 13, 2026. The top-up limit during the plan is 330,000 KRW, and unused top-up expires with the plan.
• Speed: SK Telecom lists 5G data at unlimited speeds up to 200 Mbps with tethering limited to 1 GB per day, and LTE data at a sustained 100 Mbps with no data cap.

Compare against the cost of roaming on your home plan for the same number of days. Count the days you will actually need data, and remember that a plan with a Korean number adds a passport step on arrival.

Once you are online, see our guides to the T-money card and the Climate Card and Seoul to Busan by KTX.

Carrier terms change often. Read the official plan page in full before you pay.