South Korea eSIM guide: networks, coverage and setup

Local networks

• SK TelecomLargest operator; sells tourist SIM/eSIM at Incheon and other airports.
• KTSecond nationwide network; airport counters for tourists.
• LG U+Third nationwide network; airport counters for tourists.

5G5G is available across cities on all three networks; 4G LTE covers almost the whole country.

Must-knows

• Korean identity verification (PASS app) and many bank or payment SMS checks need a resident registration number, so tourist lines cannot pass them.
• Use Naver Map or Kakao Map for directions; Google Maps walking/driving directions are limited in Korea.
• Kakao T (taxi) accepts foreign phone numbers for sign-up, but you need to receive the SMS code.
• T-money cards for subway and bus are sold at convenience stores and station machines.

Buying a local SIM

Tourist SIMs/eSIMs are sold at Incheon, Gimpo and Busan airports and online, registered with your passport. Short-term visitors without an Alien Registration Card generally get data-only or limited voice plans.

Weak-signal areas

Excellent in cities, subways and on KTX lines. Signal can weaken on high mountain trails (e.g. Seoraksan, Hallasan upper sections) and small islands.