Where the three carriers' roaming centers are, what they officially charge, and how booking ahead saves money

A foreign traveler steps out of the arrival hall at Incheon International Airport's Terminal 1, turns on their phone, and sees only a no-signal icon. Without data, there is no way to open a taxi app or check a map. A few steps away, the KT, SKT and LG Uplus roaming center signs come into view, and a handful of travelers are already lined up at the counters.

At a glance: Terminal 1's roaming centers are on the first and third floors — KT (06:00-22:00, some counters 24 hours, 02-2190-0901), SKT (06:00-22:00, some counters 24 hours, 02-6343-9000) and LG Uplus (06:00-22:00, some counters 24 hours, 02-3416-7010) — and all three carriers also operate counters in Terminal 2. According to SK Telecom's official pricing (VAT included), a foreigner-only prepaid eSIM costs 6,500 won for one day, 18,000 won for three days, 35,000 won for seven days, 71,500 won for 30 days and 143,000 won for 90 days, and it can be reserved and paid for online, then picked up at the airport roaming center with just a passport check.

Roaming centers sell two things: a physical USIM card and an eSIM downloaded onto the phone. Either way, only holders of a foreign passport can buy them, and all three carriers state that cards issued in Korea cannot be used to pay. An eSIM is installed through a QR code or activation code, so there is no physical chip to lose, while a USIM can be swapped in and used immediately at the airport counter.

Choosing a plan that does not match the length of the trip costs extra money. For example, a traveler on a seven-day trip who does not realize this and keeps paying the one-day rate (6,500 won) every day would spend 45,500 won over the week, while picking the seven-day package (35,000 won) from the start saves 10,500 won. Another useful comparison is a home carrier's own international roaming. KT's own roaming rates for its customers range from 11,000 won a day for the basic plan to 15,000 won for the premium plan, so compared with the 6,500-won daily eSIM for foreign visitors at Incheon Airport, the gap can run as high as 8,500 won a day.

Roaming center counters get crowded during peak travel periods. Reports said wait times stretched to several hours when SK Telecom customers rushed to swap their SIM cards during the 2025 Golden Week holiday (a run of consecutive public holidays in Korea that can stretch to nearly ten days when substitute holidays overlap), but that surge was tied to a one-off demand for SIM replacement after a hacking incident, and there is no official statistic on ordinary wait times for tourists buying a SIM or eSIM. Still, all three carriers advise that reserving and paying for a plan online before departure lets a traveler simply show their passport and take the product at the airport, saving the time otherwise spent in line after collecting luggage and leaving the arrival hall.

Official guidance also notes that only one eSIM with voice and text service can be purchased per person, and that travelers staying longer than 90 days may face service restrictions. Before buying, it is worth checking first whether your own phone model supports eSIM.