Unlocked iPhone vs Carrier Deal in Korea: How to Compare

As of October 2026, the quickest way to decide whether to buy an unlocked iPhone in Korea or take a carrier deal is to stop comparing sticker prices and compare what you will pay over the whole contract. Korean carriers offer two mutually exclusive benefits when you sign up: an upfront device subsidy, or a 25% discount on your monthly plan for 12 or 24 months. Over 24 months, that 25% discount adds up to roughly six times your monthly plan fee. If the subsidy you are offered is bigger than that figure, the subsidy route deserves a closer look; if it is smaller, the discount route usually wins. Installment interest, early-termination refunds and budget MVNO plans then decide the final answer.

This guide does not quote subsidy amounts for any model, because they change by plan, sign-up type and store, and they became more variable after Korea scrapped its handset distribution law in July 2025. Instead, it walks through the rules published by the Korean government and the three major carriers (SK Telecom, KT and LG U+) so you can plug in your own quotes.

Four ways to get an iPhone in Korea

Thinking of it as simply unlocked versus carrier blurs the comparison. In practice there are four routes:

1. Carrier purchase with the common subsidy. You buy the phone from a carrier store or its online shop and the subsidy is taken off the retail price immediately. You commit to a plan and a contract term.
2. Carrier purchase with the 25% discount. You still buy through the carrier but skip the subsidy and instead take 25% off your monthly plan for 12 or 24 months. Koreans call this seontaek yakjeong (selective contract discount).
3. Unlocked purchase plus a big-three carrier plan. You buy a SIM-free phone (jageupje) from Apple, an electronics retailer or an online marketplace, insert a SIM from SK Telecom, KT or LG U+, and sign up for the 25% discount.
4. Unlocked purchase plus an MVNO plan. You put the same SIM-free phone on a budget carrier (altteulpon, Korea's MVNOs). You pay the MVNO's own rates, but the 25% discount is not available.

The government's consumer portal WiseUser lists who qualifies for the 25% discount: new phones that never received a subsidy, unlocked phones bought outside a carrier, and used phones more than 24 months past first activation. The same page notes that phones on MVNO service are not eligible. That is why routes 3 and 4 can cost very different amounts even with the identical handset.

The main advantage of buying unlocked is that the device and the line are separate. If you pay for the phone up front or on your own card, you can switch carriers or downgrade your plan without a carrier installment balance tying you down. A carrier deal bundles the device discount and the plan into one contract, so you pay less at the start but have less freedom later.

What changed in July 2025

According to the joint announcement from the Ministry of Science and ICT and the Korea Communications Commission, the Mobile Device Distribution Improvement Act (known as Dantongbeop), introduced in 2014, was repealed on July 22, 2025, and an amended Telecommunications Business Act took effect. Three changes matter for iPhone buyers:

• Carriers no longer have to pre-announce subsidies, and the cap that limited extra subsidies from dealers to 15% of the announced subsidy is gone.
• Strict rules that stopped subsidies from differing by sign-up type (new line, number port, device upgrade) and by plan were removed.
• The 25% discount stays, and for the first time you can take it and still receive an extra subsidy from the store.

KT's explainer on the repeal says the old announced subsidy now operates as a common subsidy, still published voluntarily on the carrier's site. It adds that dealer extras still cannot exceed the device price, and that side promises not written into the contract are not protected. KT also states that re-contracts and SIM-only activations do not qualify for the extra subsidy, so route 3 gets the 25% discount but generally no dealer bonus.

In short, the old rule of thumb that choosing the 25% discount means no store extras is out of date. Route 2 can now beat route 3, so get written quotes from two or three stores for the same model and plan.

Putting the subsidy and the 25% discount on the same scale

A subsidy is a one-off cut to the phone price, while the discount arrives every month. Convert both to contract totals:

• 25% discount total = discount-base monthly fee × 25% × months
• For 24 months, 25% × 24 = 6, so the total is monthly fee × 6; for 12 months it is monthly fee × 3.
• Subsidy total = common subsidy + any extra subsidy offered with it

LG U+ explains that the discount is calculated on the plan's monthly fee minus any built-in contract discount, and applies only to the monthly fee, not to add-on services, so check the base figure before multiplying.

WiseUser gives a worked example from the pre-repeal era: an 800,000 won phone on a 60,000 won plan for 24 months. Taking a 100,000 won subsidy plus a 15,000 won dealer extra leaves a 685,000 won balance, or 28,541 won a month, plus the full 60,000 won plan: 88,541 won a month. Choosing the discount instead means 33,333 won a month for the phone plus a 45,000 won plan: 78,333 won a month. That is 10,208 won a month, or about 245,000 won over 24 months. The shortcut explains why: 60,000 × 6 = 360,000 won of discounts, far more than 115,000 won of subsidies. With the dealer cap gone, today's numbers may land differently, so redo the sum with your own quotes.

Interest and early-termination refunds change the answer

Two costs are easy to miss. The first is installment interest. SK Telecom's FAQ says a fee of 5.9% a year applies to installment plans of six months or more, and nothing is charged if you pay in full. Working it out as level monthly payments, financing 1,000,000 won over 24 months comes to about 44,275 won a month, or roughly 62,000 won in interest. A subsidy shrinks the financed amount and the interest with it; the discount route finances the full price. Buying unlocked and paying up front avoids this cost, though card installment terms vary by issuer.

The second is the refund owed if you break a discount contract early. Under LG U+'s rules for customers who joined from February 1, 2020, leaving a 24-month contract within six months means repaying 100% of the discount received; from month seven you repay the discount received × remaining term ÷ (term − 180 days). For 12-month contracts the full-refund window is three months and the divisor uses 90 days. LG U+'s example: a customer saving 12,250 won a month cancels a 24-month contract after nine months, so 110,250 won of discounts × 15/18 = 91,875 won owed.

Because the 25% rate is the same for either term, a 12-month contract is the safer pick if you might switch within a year. LG U+ also offers a 12+12 option that pre-books a second year, cancellable without penalty before the first year ends, and waives the refund if poor coverage where you live makes you cancel within 14 days of activation and you return everything undamaged. Penalties on the subsidy route vary by carrier, but the contract must now spell out who pays the subsidy, the plan and add-on conditions attached to it, and any broadband bundle requirements, so read the termination terms before signing.

When unlocked plus an MVNO makes sense

Because the 25% discount only exists on SK Telecom, KT and LG U+, the MVNO question is simple: compare the big-three plan after 25% off with the MVNO's monthly price. If the MVNO is clearly cheaper and its data allowance and coverage suit you, route 4 can win over 24 months. It fits best if you can pay for the phone up front or interest-free, want to change plans without a carrier contract, and are not getting family or home-broadband bundle discounts from a major carrier. If those bundles are large, or stores are offering generous extras, a carrier deal may come out ahead.

A checklist before you sign

1. Decide how long you will keep the phone and whether you might switch carriers mid-term.
2. Check eligibility for the 25% discount. WiseUser points to imei.kr; on an iPhone the IMEI is under Settings > General > About.
3. Build a 24-month total for each route: device price after discounts + interest + (monthly fee − discount) × months.
4. Get quotes in writing and only count numbers that appear in the contract.
5. Diary the contract end date. LG U+ lets you book a new discount contract from 180 days before expiry, and KT notes you must reapply once a contract ends to keep the discount.

Unlocked versus carrier is less a price contest than a choice of contract structure. Put the subsidy next to monthly fee × 6, add interest and refund risk, and confirm everything against the written contract.

Sources

• 이달 22일부터 단통법 폐지…'요금할인+추가지원금' 혜택 가능 (대한민국 정책브리핑)
• 25% 요금할인 조회 - 선택약정 할인 제도 (와이즈유저 방송통신이용자정보포털)
• 선택약정 할인 (LG U+)
• 단통법 폐지 안내 (KT)
• [구매] 할부 수수료가 무엇인가요? (SK텔레콤 T world)