Phone & Internet

Focused phone guides

If you need to choose quickly, start with the Korea SIM card guide for foreigners. It explains when to use eSIM, prepaid, airport SIM, postpaid, or MVNO service, and why a Korean phone number matters for app verification.

Roaming from your home country

Some plans from your home carrier include Korea data for free or cheaply, which can mean you skip the SIM dance entirely for short trips:

• T-Mobile (US) — Magenta, Magenta Max, and Go5G plans all include unlimited international data at slow speeds (~256kbps in Korea) at no extra cost. Workable for maps, messaging, and casual browsing. Calls are $0.25/min.
• Verizon (US) — TravelPass adds your domestic plan to Korea for $10/day (capped at $100/month).
• AT&T (US) — International Day Pass at $10/day.
• EE / O2 / Vodafone / Three (UK) — most UK carriers offer paid roaming packs for Korea; check before flying. Some higher-tier business plans include data.
• Optus / Telstra / Vodafone (Australia) — Korea is covered by international roaming packs at AU$5-15/day depending on plan.
• Rogers / Telus / Bell (Canada) — Roam Like Home plans cover Korea at C$12-15/day.

For stays beyond a week, a local Korean prepaid SIM almost always works out cheaper — and gives you faster data than the slow-speed roaming most plans offer.

Prepaid vs postpaid

Prepaid (선불)

The right choice for your first weeks. SK Telecom, KT, and LG U+ all operate booths in the arrivals hall at both Incheon Terminal 1 and Terminal 2 — show your passport, pay by card, walk out with an activated SIM. Typical: ₩30,000–₩50,000 for 30 days of unlimited data. If you want it ready the moment you land, you can also order an eSIM online from the carriers' English sites and activate on arrival.

Postpaid (후불)

Requires an ARC and a Korean bank account or credit card. Plans run ₩25,000–₩90,000/month depending on data. MVNOs (알뜰폰) like Chingu Mobile, U+ Mobile, and KT M Mobile resell the big-three networks at much lower prices.

Carriers in brief

• SK Telecom — best coverage rurally, priciest.
• KT — strong urban, simpler English support.
• LG U+ — cheapest of the three, fine in cities.
• MVNOs (알뜰폰) — same networks at 30–50% off. Often have foreigner-targeted resellers like Chingu Mobile.

Home internet

Gigabit fiber is the default — typically ₩25,000–₩40,000/month with a 2- or 3-year contract. KT, SK Broadband, and LG U+ are the three providers. Installation usually happens within a few days. If you live in an apartment, the building may already have a preferred provider with promotional pricing.

Many rental contracts include internet — ask before signing up separately.

Useful Korean apps you'll want

• KakaoTalk — the dominant messenger; everyone uses it
• Naver Map / Kakao Map — Google Maps is limited in Korea
• Papago — Korean-aware translator, better than Google Translate for Korean
• Coupang — same-day delivery for almost anything