Korea SIM Card Guide: Phone Plans for Foreign Residents

Getting connected in Korea: your options

A Korean phone number is not just for calls. You need it to verify bank accounts, receive one-time passcodes, use Korean apps, and receive government notifications. Set this up as soon as possible after arrival.

You have three main options:

Recommended path: Get an airport SIM on arrival. Once your ARC arrives, switch to an MVNO plan for long-term savings.

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Option 1: Airport prepaid SIM (best for first days)

Airport prepaid SIMs are the fastest way to get a Korean number on day one. Buy at a counter in the Incheon Arrivals hall with just your passport, no ARC required. Expect to pay ₩55,000–₩60,000 for 30 days of data, calls, and texts on SKT, KT, LG U+, or an MVNO. The SIM activates immediately.

Where: Incheon Airport, Arrivals halls, Terminal 1 and Terminal 2 What you need: Passport only Cost: ₩55,000–₩60,000 for 30 days (data + calls + texts) Carriers available: SKT, KT, LG U+, and several MVNOs

Airport SIMs are sold at dedicated counters past customs. Staff speak basic English. The SIM is activated immediately and works across Korea.

Limitation: These are short-term plans. When they expire, you will need to top up (if prepaid) or switch to a monthly plan (requires ARC).

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Option 2: Monthly contract plan (best for long stays)

A monthly contract (후불요금제) gives you a permanent Korean number with full-feature data, calls, and texts for ₩40,000–₩80,000 per month. You need your ARC (외국인등록증), passport, Korean bank account for direct debit, and your phone's IMEI. Setup at an official carrier store takes 20–30 minutes. Use SKT, KT, or LG U+ directly, or an MVNO for cheaper rates.

After your ARC arrives, get a monthly contract for better value and a stable Korean number.

What you need:

• ARC (외국인등록증)
• Passport
• Korean bank account (for direct debit billing)
• Your phone's IMEI number (Settings, About Phone, IMEI)

Step 1, Choose a carrier

All three have nearly identical coverage in Seoul and major cities. Outside Seoul, SKT has the edge in rural areas.

Step 2, Visit a store

Go to an official carrier store (공식 대리점), not a third-party reseller. Third-party stores sometimes add fees that are not part of the standard plan. Official stores are marked with the carrier logo prominently.

Bring all documents. The setup takes 20–30 minutes.

Step 3, Choose a plan

Most plans include:

• Unlimited or very high-cap data (usually 100GB+)
• Unlimited domestic calls and texts
• Roaming add-ons available separately

Monthly plan prices: ₩40,000–₩80,000 per month for full-feature plans.

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Option 3: MVNO (알뜰폰), best value for most foreign residents

MVNOs (알뜰폰) are budget carriers that resell SKT, KT, and LG U+ network capacity at 50–70% lower prices with identical coverage. Plans start at roughly ₩9,900–₩13,000 per month. Signup requires an ARC and Korean bank account, often online or at CU/GS25 convenience store counters. Activation takes 1–2 business days rather than the instant setup at a carrier store.

MVNOs use the same infrastructure as SKT, KT, and LG U+ but charge 50–70% less. Coverage is identical.

Popular MVNOs:

How to sign up: Most MVNOs allow online signup if you have an ARC number and Korean bank account. Some have English-language websites. You can also sign up in person at select convenience stores (CU, GS25 have MVNO counters).

MVNO activation takes 1–2 business days, unlike carrier stores where it is instant.

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Name registration (명의): what foreign residents need to know

Korean telecom law (전기통신사업법) requires every SIM to be registered to the real legal name of the account holder, a requirement called 명의 (myeong-ui). Your name on file must exactly match your ARC or passport. Using a SIM registered to an employer, landlord, or friend is technically a violation and leaves you without control of your own phone number if that relationship ends.

What this means for you:

• You cannot use a SIM registered in someone else's name
• Your name on the account must exactly match your ARC or passport
• If you let your employer register the SIM in the company's name, you do not technically own the number; this can cause problems if you change jobs

Using someone else's phone account: Some employers or landlords offer to put a phone in their name for you while you wait for an ARC. This is technically legal but creates risks: if you leave the job or apartment, the SIM owner can cut off service. Get your own as soon as possible.

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Phone compatibility check

Most modern unlocked phones work on Korean networks, but confirm the bands before you fly. Korea uses LTE Band 1 (2100MHz) as the primary 4G band, LTE Band 3 (1800MHz) as secondary, and 5G Band n78 (3500MHz) for 5G. If your phone is carrier-locked abroad, unlock it first. Some carriers now support eSIM for recent iPhone and Android models.

Before arriving in Korea, check your phone is compatible:

Check your phone supports:

• LTE Band 1 (2100MHz), essential
• LTE Band 3 (1800MHz), recommended
• 5G Band n78 (3500MHz), for 5G speeds

Check your phone is unlocked: An unlocked phone works with any SIM. If your phone is locked to a carrier, contact your home carrier to unlock it before traveling.

eSIM: Some carriers (SKT, KT) now offer eSIM for compatible iPhone and Android models. This lets you activate a Korean number without a physical SIM card. Confirm eSIM availability when visiting the store.

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Korean number format

Every Korean mobile number uses the prefix 010 followed by two four-digit groups, written as 010-XXXX-XXXX for a total of 11 digits. The 010 prefix is universal across SKT, KT, LG U+, and all MVNOs, so the carrier is not visible from the number itself. Write numbers with hyphens when sharing with Korean contacts to match local convention.

Korean phone numbers follow this format:

• Mobile: 010-XXXX-XXXX
• 010 is the standard prefix for all mobile numbers in Korea
• Total digits: 11 (including 010)

When giving your number to Korean contacts, write it as 010-1234-5678 with hyphens for clarity.

What's changed

• 2026-05-28: /en voice retune (Lonely Planet voice model, stripped AI-corporate + bureaucratic phrasing, problem-first opener, removed "expats" from title and guide).
• 2026-04-21: Retrofitted for AI-search citability, added direct-answer passages at the top of each section.

@misc{seoulstart-korea-sim-card-guide,
  author = {{Seoulstart Editorial Team}},
  title = {{Korea SIM Card Guide: Phone Plans for Foreign Residents}},
  year = {2026},
  publisher = {Seoulstart},
  url = {https://seoulstart.com/guides/korea-sim-card-guide},
  note = {Last updated May 28, 2026}
}