SIM, eSIM
& WiFi

How long are you here?

Trip length picks the option that saves money + hassle.

Quick facts

Four options compared

Real tradeoffs, not just price. SMS verification is the trap most guides miss. Tap any option for the full setup + where-to-get + watch-out guide.

• Home-carrier roaming

  When Your plan already covers Korea (T-Mobile, EE, Vodafone, JP carriers, etc.). Quick trips, no friction.

  Pros

  • Zero setup. Plane lands and you have signal.
  • Keep your number for SMS verification at home.

  Watch out

  • Often slower (throttled to 256kbps to 5Mbps after a fair-use cap).
  • Sometimes blocks tethering.
  • Expensive if not included in plan (₩15,000 to ₩30,000 per day).
  Full setup guide →

• eSIM online (before arrival)

  When Phone supports eSIM (iPhone XS+, Pixel 3+, Samsung S20+). Want zero airport faff.

  Pros

  • Activate before you board. Internet works the moment you land.
  • No counter queue, no SIM swap.
  • Keep your home SIM in for receiving SMS.

  Watch out

  • Most are data-only (no Korean number, no SMS receive).
  • Cannot verify Korean apps that need SMS (KakaoTalk, Naver, Coupang).
  Full setup guide →

• Prepaid SIM at airport

  When Standard tourist visit, want full Korean number including SMS.

  Pros

  • Unlimited 5G/LTE data.
  • Comes with a Korean number for SMS (verify Korean apps).
  • KT counter staff speaks English.

  Watch out

  • Counter queue can be 20+ minutes during peak arrivals.
  • Need to swap your physical SIM in.
  • Passport required for activation by Korean law.
  Full setup guide →

• Pocket WiFi rental

  When Phone is locked / cannot accept other SIMs. Group of 2 to 4 sharing one connection.

  Pros

  • Connect up to 5 devices at once (iPad + laptop + phone).
  • No SIM swap, no eSIM compatibility check.
  • Often cheaper for small groups vs. multiple SIMs.

  Watch out

  • Extra device to carry, charge, and not lose.
  • Battery dies mid-day; need to charge.
  • Round-trip pickup + return at airport.
  Full setup guide →

Where to pick up

• Incheon Airport (ICN), Terminal 1

  Arrivals floor (1F), between Gates 5 and 10.
  KT, SKT, LG U+ all have counters.
  KT Roaming Center is the most foreigner-staffed (English on hand).
  Open ~6am to ~10pm, late arrivals can be tight.

• Incheon Airport (ICN), Terminal 2

  Arrivals (1F), near the central plaza.
  Same three carriers.
  Quieter than T1 since fewer flights land here, often a faster pickup.

• Gimhae Airport (PUS), Busan

  Busan's own international airport, with direct flights from Japan, China and Southeast Asia.
  If you fly straight into Busan, pick up a prepaid SIM in the international arrivals hall (a smaller selection than Incheon), or set up an eSIM online before you land to skip the counter.

• Online (before arrival)

  eSIMs from Airalo, Holafly, Ubigi.
  Physical-SIM-by-mail is also offered by Klook / Trazy with airport pickup vouchers.

Watch out for

• Passport, every time Korean law requires passport ID for any SIM activation, even tourist prepaid.
  Counters cannot bend this.
  Bring it to the airport counter, not in checked luggage.
• Data-only vs voice eSIMs from Airalo / Holafly / Ubigi are data-only by default.
  They do not give you a Korean phone number, so you cannot receive SMS.
  KakaoTalk, Naver, and Coupang verification will fail.
  If you need a Korean number, get a physical prepaid SIM at the airport.
• Check 5G coverage All three carriers have decent 5G across Busan and other major cities.
  Outside metro areas (rural day trips), coverage drops to LTE.
  Not a problem for most visitors but matters if you are heading to remote islands or hiking deep in the mountains.
• Watch the daily cap Some "unlimited" prepaid plans throttle after a daily cap (e.g. 5GB/day full speed, then 1Mbps).
  Fine for maps + messaging, painful for video calls.
  Read the plan card at the counter.
• Public WiFi exists Most subway stations, cafes, and tourist areas have free WiFi (KT_GiGA_WiFi, SK_WiFi, etc.) but they often need a Korean phone number to authenticate.
  Cafes are easier, just ask staff for the password.

Sources

Updated July 2026. Carrier prepaid pricing is reviewed quarterly; ranges shown above. Check direct links for current promo plans.