Getting a Phone Plan in Korea as a Foreigner: Prepaid, MVNO (알뜰폰) and Contracts

In Korea a phone number is more than a phone number. It's your identity verification (본인인증) for banking apps, Hometax, HiKorea, delivery apps, transport refunds and even some websites' sign-ups. Verification checks that the number is registered in your own name with your passport or ARC. So the first rule: get a line in your name, not a friend's.

Your 3 options

The 25% discount most foreigners miss

If you bring your own phone (or don't take a handset subsidy), the big-3 carriers offer selective agreement discount (선택약정할인): 25% off the monthly plan for a 12- or 24-month commitment. It's a government-set scheme. Early termination fees apply if you cancel early.

Compare MVNO plans in one place

The government-supported 알뜰폰허브 (mvnohub.kr) lists MVNO plans and lets you filter by network, data, and price.

The full guide covers a step-by-step path from arrival to the cheapest stable plan, the documents, Korean phrases for the shop, how to port your number, the traps (promo price cliffs, handset installments, visa expiry suspensions), and what to cancel before you leave Korea.

Step-by-step: from arrival to the cheapest stable plan

Stage 1 — Arrival (Day 0–7): prepaid

1. Buy a prepaid SIM or eSIM with your passport at the airport carrier booths or a city carrier shop.
2. Ask for a Korean number (not data-only). You need it for ARC booking SMS, bank OTP and delivery apps.
3. Phrase: "선불 유심 사고 싶어요. 한국 번호 있는 걸로요. 여권 여기 있어요." *(I'd like a prepaid SIM with a Korean number. Here's my passport.)*

Stage 2 — After ARC + bank account (Week 3–6): switch to postpaid

1. Check your monthly data use (phone settings) to choose a plan size.
2. Compare on mvnohub.kr and carrier sites.
3. Sign up online (some MVNOs accept ARC verification) or in a shop.
4. Port your number (번호이동) so you keep the same number. Banks and apps stay linked.

Stage 3 — Every 6–12 months: recheck price

Many MVNO deals are promotional for a fixed number of months, then jump. Set a calendar reminder for the month the promotion ends.

Documents

• [ ] Passport (prepaid) / ARC (postpaid)
• [ ] Korean bank account or card for auto-payment
• [ ] Your unlocked phone. Check that it supports Korean bands and that eSIM is supported if you choose eSIM
• [ ] Your Korean address (from your lease)

Shop phrases

• "자급제 폰이에요. 선택약정 25% 할인 받을 수 있어요?" *(It's an unlocked phone. Can I get the 25% selective discount?)*
• "약정 기간이랑 위약금이 어떻게 돼요?" *(What's the contract term and early-termination fee?)*
• "부가서비스는 다 빼 주세요." *(Please remove all add-on services.)*
• "프로모션 끝나면 요금이 얼마예요?" *(What's the price after the promotion ends?)*

Cost reality (indicative, check current offers)

• Prepaid: a higher price per GB; fine for the first weeks.
• MVNO: often the cheapest per GB on the same networks, especially for moderate data users.
• Big-3 with 25% selective discount: competitive for unlimited data; easier in-person support. *Prices change monthly, so check mvnohub.kr and carrier sites for current numbers. We don't list exact prices here because they go out of date quickly.*

Visa expiry and your phone

Carriers record your ARC expiry. When your stay is extended, update your carrier (online or in a shop, with your ARC or the permission confirmation). Otherwise the line may be suspended or restricted on the old expiry date.

Handset installments (단말기 할부)

Avoid a 24–36-month installment if you might leave Korea sooner. You'll have to pay the remaining balance before cancelling. The same goes for TV/internet bundles with 3-year terms.

Traps and common mistakes

• "Free phone" deals with expensive plans and hidden add-ons (부가서비스) you must keep for months.
• Line in a friend's name: identity verification fails for you, and the account holder is legally responsible for the line, which often leads to disputes.
• Opening a line for someone else (명의대여): illegal, and it can be used for fraud in your name.
• Promo price cliff: an MVNO plan doubling after 6–7 months.
• Unpaid final bill after leaving Korea, which goes to collection and can complicate a future visa or account.

Before you leave Korea: cancellation checklist

• [ ] Pay off any handset installment
• [ ] Cancel the line (online or at a shop), or switch to prepaid if you'll return
• [ ] Change the phone number linked to your bank, Hometax and other key apps if you're keeping those accounts
• [ ] Get the final bill and confirm the auto-debit took it
• [ ] Return rented equipment (routers, set-top boxes)

eSIM tips

• Most recent iPhones and many Galaxy models support eSIM; keep your home number on the physical SIM and use a Korean eSIM, or vice versa.
• Make sure the eSIM is registered to your residence card (not just passport) if you need verification.
• If you change phones, eSIM transfer may require re-issuance — keep the provider's contact info.

Identity verification (본인인증) problems — fixes

• Name order mismatch: Korean systems use the name exactly as on your residence card (often SURNAME GIVENNAME, all caps, with spaces). Make sure the carrier entered it identically.
• Number not in your name: verification only works for the subscriber. A friend's line will not work.
• Choose "foreigner" (외국인) on the verification screen; some sites have separate tabs.
• Still failing? Use the PASS app or ask the carrier to confirm your registration details.