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. Pricing depends on how long you need service and the data cap: short or capped plans start around ₩30,000, while premium unlimited 30-day packs run up to ₩55,000–₩60,000 on SKT, KT, LG U+, or an MVNO. The SIM activates immediately.

If you can install an eSIM, travel data plans from providers like Airalo, Saily, or Holafly are often cheaper than the physical airport counters and can be set up before you land.

Where: Incheon Airport, Arrivals halls, Terminal 1 and Terminal 2 What you need: Passport only Cost: roughly ₩30,000–₩60,000 depending on duration and data cap 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 ₩45,000–₩80,000 per month. You need your Alien Registration Card (also called the Residence Card, 외국인등록증), passport, a payment method for autopay, and your phone's IMEI. A Korean bank account works for direct debit, but many carriers also accept a Korean-issued credit or debit card, so you do not always have to wait until your bank account is open. 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:

• Alien Registration Card (also called the Residence Card, 외국인등록증)
• Passport
• A payment method for autopay: a Korean bank account for direct debit, or a Korean-issued credit or debit card
• 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, and the rural gap has narrowed in recent years. SKT historically had the strongest rural footprint, but all three are now competitive nationwide.

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
• Unlimited domestic calls and texts
• Roaming add-ons available separately

Monthly plan prices: ₩45,000–₩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. Entry-level plans start around ₩11,000 per month for the smallest data buckets, with 10GB+ plans typically running ₩15,000–₩25,000. Signup requires an ARC and a Korean payment method, 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. For current pricing, the government-affiliated Altteulpon Hub (알뜰폰 Hub, mvnohub.kr) compares every provider's plans side by side.

Popular MVNOs:

Prices are starting floors for the smallest data plans and change often, so check each provider or the Altteulpon Hub before you sign up.

How to sign up: Most MVNOs allow online signup if you have an ARC number and a Korean payment method. LG Hello Mobile offers a foreigner self-activation service that lets ARC-holders activate a postpaid plan entirely online, with no call-center step. Some providers 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 a gray area at best. It only holds up if the line is registered as the company's corporate line for genuine business use, not as a personal-use line in someone else's name, which is a borrowed-name (차명) real-name registration violation. Either way it leaves you exposed: if you leave the job or apartment, the registered owner can cut off service. Get your own SIM as soon as your ARC arrives.

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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. All three carriers 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: All three carriers (SKT, KT, LG U+) 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.

@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 June 21, 2026}
}