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Arrival

📡 Get data working in the first 20 minutes

Do this before you look for AREX. Kakao T, maps, and translation all assume a working packet data connection. Full SIM comparison: <a href="esim.html">eSIM page</a>.

Pre-installed eSIM: turn on data roaming for that line, select the Korean network the vendor named (often KT/SKT/LG U+). Airplane mode toggle once if it sits on “searching.”
Airport counters sell physical SIMs after immigration. Passport required. Know whether your phone is SIM-locked to a home carrier.
Do not roam on your home plan “for a day to see.” Bill shock is real. If you must, cap data in iOS/Android settings.
Then buy T-money and ride. Order: data → maps pin → transport. Airport checklist.

Dual-SIM users: keep the home SIM for SMS banks, Korean eSIM for data. Some banking apps still hate this combo.

eSIM vs SIM → Wi-Fi backup →