Ending a Korean Phone Contract Early: What You'll Really Pay

Your contract still has months left.

Maybe your flight home is booked. Maybe you found a cheaper plan. Or maybe your ARC (Alien Registration Card, now officially called the Residence Card) is about to expire. Either way, you’re looking at a Korean phone bill and asking one question. How much will it cost to walk away?

You signed up, got a nice monthly discount, and nobody explained the exit. That’s normal. Store staff explain how a contract starts, not how it ends. Korean phone plan for foreigners

The good news? Leaving early is legal and routine. But the bill comes in pieces. The order you handle them in decides whether you leave clean or leave debt behind.

Why your “penalty” is really three separate bills

Ending a Korean postpaid contract early can create up to three charges. The first is repayment of the 25% optional discount. The second is repayment of any upfront device subsidy. The third is the unpaid balance on your phone. Only the first two are true penalties. The third is simply the rest of a loan you already took out.

Koreans call the penalty wiyakgeum (위약금, breach fee). It isn’t a fine. It’s the carrier taking back discounts it gave you in exchange for staying.

Here is what each part means.

• Optional contract discount (seontaek yakjeong, 선택약정). You agreed to stay 12 or 24 months. In return, the carrier cut your monthly plan fee by 25%. Leave early and you repay part of that discount.
• Device subsidy (gongsi jiwongeum, 공시지원금). The carrier paid part of your phone’s price upfront. Leave early and you repay a share of it.
• Device installment balance (halbu, 할부). If you bought the phone in monthly payments, the rest is still yours to pay. Cancelling the line does not cancel this.

Your contract papers list which benefits you received. Many plans use one or the other, not both.

The rules shifted in 2025. The Mobile Device Distribution Improvement Act (known in Korea as Dantongbeop, 단통법) was repealed, and the repeal took effect on July 22, 2025. According to the Ministry of Science and ICT, the 25% optional discount was kept and moved into the Telecommunications Business Act. So the discount still exists. So does the duty to repay it.

Here’s the catch. Since the repeal, stores can offer extra cash or subsidies with no legal cap. These often come with side conditions, like “keep this expensive plan for 6 months.” Break that condition, and the store may ask for money back on top of the carrier’s penalty. If a store promised you anything, get it in writing.

So how big is each piece? That depends on one date printed on your contract.

How the penalty fee calculation works, and when it hurts most

Carriers base the discount repayment on the total discount you have already received. They then apply a refund rate that falls as you near the end of your term. Subsidy repayment is generally prorated by the days you have left. Leaving in the first year usually costs the most. Your carrier’s app or the 114 helpline gives the exact figure for your line.

Let’s put rough numbers on it. These are illustrations only. Real tables differ by carrier and plan.

Example: the 25% discount

Say your plan lists at 69,000 won a month. A 25% discount saves you 17,250 won monthly. After 8 months, you’ve saved 138,000 won.

Leave now, and the carrier will ask you to return much or all of that 138,000 won. Wait until month 20, and the refund rate is far lower. At the end of the term, it drops to zero.

Example: the device subsidy

Say the carrier gave you a 300,000 won subsidy on a 24-month term. You leave with 12 months left. A prorated repayment would be roughly half. That’s about 150,000 won.

Notice the pattern? The discount penalty grows while you keep collecting discounts. Then it shrinks later in the contract. That’s why the first 12 months are usually the most expensive time to leave.

How to get your real number

Don’t guess. Use one of these:

1. Open your carrier’s official app (T world for SK Telecom, or the official KT and LG U+ apps). Look for the cancellation penalty lookup (위약금 조회).
2. Dial 114 from your own phone. SK Telecom, KT, and LG U+ all use this number and offer English support.
3. Visit an official carrier store with your ID.

Ask for the total in three lines: discount repayment, subsidy repayment, and device balance. If staff give you one lump number, ask them to split it.

One more thing. Moving your number to another carrier counts as cancelling your old contract. That includes budget carriers. The penalty still applies.

But the penalty is often not the biggest number on the sheet. That honor usually goes to the phone itself.

The device balance most people forget until they reach the counter

If you bought your phone on installments, the remaining balance stays due after you cancel. Ending the line does not end the loan. You can keep paying monthly or pay it all at once. If you’re leaving Korea for good, device installment payoff before leaving is the safer path. Monthly debits fail once your Korean bank account is closed.

A new flagship phone can cost well over 1,000,000 won. With a year left on a 24-month plan, the balance alone can run to several hundred thousand won. That’s often more than the penalty.

Paying off early has a quiet upside. Carriers add an installment fee, charged as an annual rate on the remaining balance. Pay it off now and those future fees stop.

What happens if you leave it unpaid

But it gets worse if you ignore it. Major carriers usually back installment sales with guarantee insurance. If you stop paying, the debt can move to the insurer or a collection agency. It doesn’t disappear when you board a plane.

Carriers also share unpaid telecom bills through the Korea Association for ICT Promotion (KAIT). That record can block you from opening a new postpaid line later. Think of someone switching from D-10 to E-7, or coming back on an F-6 marriage visa.

The order that keeps you debt-free

1. Check the penalty and device balance (previous section).
2. Pay off the device, or confirm in writing how you’ll pay it.
3. Cancel the line and pay the final settlement at the store.
4. Ask for a cancellation confirmation (haeji hwaginseo, 해지확인서).
5. Only then close your Korean bank account.

close Korean bank account before departure

Step 3 sounds simple. It isn’t, if you show up with the wrong ID.

Required documents to cancel, and the one item that catches people out

To cancel a postpaid line in person, bring your passport or Residence Card, the phone or USIM card, and a way to pay the final amount. The account holder should go in person. If someone else goes for you, carriers usually ask for a signed power of attorney plus ID copies for both of you. Requirements vary, so call 114 first.

Your basic kit:

• Passport or Residence Card (ARC). The name must match your contract exactly, including spelling and order.
• The phone or USIM. Some stores check the device or SIM.
• Payment method. A Korean debit card, credit card, or cash for the final settlement and any device payoff.
• Contract details. Your phone number and, if possible, the contract or a screenshot from the carrier app.

Go to an official carrier store (a directly run branch or an authorized agency). Small resale shops that sell phones often can’t process a cancellation.

The item that catches people out: your ARC

Here’s what actually happens at the airport. When you leave Korea for good, you hand your Residence Card back to immigration.

Under Article 37 of the Immigration Act, a registered foreigner who departs Korea must return the residence card to an immigration officer at the port of departure, except in cases such as leaving with plans to re-enter within the permitted period. (Summary of the statute as published by the Ministry of Government Legislation)

The Korea Immigration Service and HiKorea explain the same departure rule. Once your card is returned or expired, identity checks get harder. Bank apps, carrier apps, and online verification often rely on a valid ARC and an active Korean number.

So cancel while your card is still valid and in your hand. That one choice removes most of the friction. return ARC when leaving Korea

If you’ve already left Korea

Contact your carrier’s customer center through its official website or English line. Carriers handle overseas cancellations case by case. Expect to send a passport copy and a signed request. You may also need a power of attorney for someone in Korea. It works. It’s just slower.

Not everyone has to deal with any of this, though. Some readers owe nothing at all.

Prepaid vs postpaid difference: why some readers owe nothing

Prepaid plans in Korea have no contract term, so there is no early termination penalty. You stop topping up, and the line expires after its validity period. Postpaid plans bill you monthly and usually attach discounts to a contract term. That contract is what creates the penalty. Many budget carriers sit in between, offering postpaid plans with no contract at all.

How do you know which one you have? Ask yourself one question. Do you get a bill every month after using the service? Then you’re postpaid.

Budget carriers are MVNOs. They rent network capacity from SK Telecom, KT, or LG U+. Many offer no-contract plans, so you can leave whenever you want. If you bought your phone separately, there’s no device balance either.

This matters for planning. A D-2 student who expects to leave after graduation can avoid the whole problem. So can an E-9 worker near the end of an employment contract. The fix is simple: choose a no-contract plan from the start.

Not sure what’s open under your name? M-Safer, run by KAIT, shows the mobile lines registered to you, if you can pass its identity check. To compare plans, the government-backed Smart Choice site lists carrier and budget plans side by side.

Once you know your plan type, one question is left. When exactly should you pull the plug?

SIM deactivation before departure: the timing that saves a headache

Cancel your line a few days before your flight, not on the way to the airport. You need the number active for verification texts from your bank, Government24, and pension or tax offices. You also need time to settle the final bill. A gap of three to five days before departure usually covers both. Close your bank account last.

Why not cancel earlier? Because your Korean number is a key. Many services send a one-time code by text. Lose the number too soon and you can lock yourself out of your own bank account.

Finish these while your line is still active:

• National Pension refund. Many departing foreigners can claim a lump-sum refund through the National Pension Service. Some steps rely on phone or online verification. national pension lump-sum refund foreigners
• Tax matters. If you need to settle income tax before leaving, the National Tax Service Hometax service often asks for text verification.
• Government24 documents. Download any certificates you need from Government24 while you can still log in.
• Bank transfers. Send money abroad or move your balance before you lose app access.

Leaving only for a while?

Cancelling may be the wrong move. Think of a D-2 student going home for the summer, or an F-4 or F-5 resident traveling for a few months. Carriers offer a temporary suspension (ilsi jeongji, 일시정지) for overseas stays. Fees drop, and your number stays yours. Ask whether the suspension also pauses your contract clock. That changes when your term ends.

eSIM users

Cancelling the line ends service, but the eSIM profile may stay on your phone. Delete it in your settings after the store confirms cancellation. Selling the phone? Do a factory reset too.

Your five-step exit checklist

1. Two weeks out: check your penalty and device balance through the app or 114.
2. One week out: finish pension, tax, and banking tasks that need text verification.
3. Three to five days out: visit an official store with your passport and ARC. Pay the settlement and device balance.
4. Same visit: get a cancellation confirmation and keep a photo of it.
5. Last: close your bank account, then hand in your ARC at the airport.

If anything on the final bill looks wrong, the Korea Consumer Agency handles telecom complaints. Its 1372 Consumer Counseling Center takes them by phone.