SIM cards and eSIM help sit under the KT Roaming Center sign
At Gimpo International, the KT Roaming Center sits in the International terminal landside, used mainly by arrivals heading into Seoul who skipped SIM setup at Incheon. Look for the KT branding near the check-in and ticketing area before security, so you can sort data and calls before you queue for screening.
Staff handle prepaid SIMs, eSIM activation, and roaming plan adjustments tied to KT numbers, which helps if you landed at GMP on an international flight and need a quick data fix for Naver Maps and KakaoTaxi. Prices shift by data volume and days, but packages usually cost less than what most home carriers charge for a single day of overseas roaming.
Service counters often open from morning through late evening to match international bank of flights at Gimpo, roughly aligning with departures to Tokyo, Osaka, and Shanghai. If you land after the last international arrival, though, you may find shutters down and will need to rely on airport Wi‑Fi until the next morning.
Expect basic plug-and-play setup help: APN settings, hotspot toggle advice, and a quick compatibility check for visitors carrying phones from the US, Europe, or Southeast Asia. They also handle top-ups for existing KT tourist plans, which is handy if you started your trip at Incheon and are flying out through GMP.
Tip: stop here before you clear security in the International terminal; once you head airside, telecom options shrink to vending-style kiosks with less human help.