Korea SIM Card Guide: Phone Plans for Expats

Getting connected in Korea: your options

A Korean phone number isn't just for calls, you need it to verify bank accounts, receive OTP codes, 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)

Where: Incheon Airport, Arrivals halls, Terminal 1 and Terminal 2 What you need: Passport only Cost: ₩33,000–₩44,000 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'll 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)

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 illegal fees. 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/month for full-feature plans.

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

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).

Important: MVNO activation takes 1–2 business days, unlike carrier stores where it's instant.

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Name registration (명의): what foreigners need to know

All Korean SIM cards must be registered under your real legal name, this is called 명의 (myeong-ui). This is not optional.

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 don't 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/apartment, the SIM owner can cut off service. Get your own as soon as possible.

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Phone compatibility check

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

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.