Getting a Korean Phone Number as a Foreigner
A Korean phone number is not a convenience here. It is the key that most other services check for before they let you in — banking apps, delivery apps, taxi apps, government portals, even buying concert tickets. Almost all of them authenticate by sending an SMS to a Korean number, and a foreign number fails the check silently.
This is what it takes to get one, and where the money is.
Two different things called "a SIM"
Prepaid tourist SIM. Sold at the airport and in convenience stores. Needs a passport and nothing else. Gives you data and, depending on the plan, a temporary number.
The limitation is not coverage — it is verification. Many Korean services distinguish between a contract-backed number and a prepaid one, and a prepaid number often fails identity verification even though calls and texts work perfectly. If you are here for two weeks, this is all you need. If you are staying, it is a stopgap.
Contract number. A regular monthly line in your name. This is what services accept. It normally requires an alien registration card.
What you need for a contract
- Alien Registration Card (ARC) — the foundation
- Passport — secondary ID
- Korean bank account or a card for payment — see opening a Korean bank account
- A physical address
The dependency chain trips people up: the phone contract usually wants a bank account, and the bank account application often wants a phone number. The resolution is order of operations — get the ARC first, then the bank account (a branch will open one without a phone number if you have the ARC and proof of purpose), then the phone contract.
The choice most arrivals get wrong
Korea has three major carriers — SKT, KT, and LG U+ — and a large number of MVNOs, called altteul phones in Korean, that resell capacity on those same networks.
| Major carrier | MVNO (altteul) | |
|---|---|---|
| Network | Their own | The same physical networks |
| Monthly cost | Higher | Substantially lower |
| Coverage | Identical | Identical |
| English support | Better in flagship stores | Limited |
| Handset subsidies | Yes | Rare |
| Perks | Cinema, café, roaming discounts | Few |
This is the single largest saving available to a new arrival, and most people miss it because MVNOs do not have shops on every corner. Coverage is identical — it is the same towers. What you give up is retail support, handset subsidies, and bundled perks.
If you already own an unlocked phone and do not need hand-holding, an MVNO SIM-only plan costs a fraction of a major-carrier contract for the same signal. The Korea Communications Commission regulates all of them identically.
Where to actually go
A major carrier's flagship store in a foreigner-heavy district. Branches near universities and in areas like Itaewon, Hongdae, or Gangnam handle foreign customers regularly and are far more likely to have someone who can explain the contract in English. A neighbourhood branch that has never processed a foreign application will take longer and is more likely to refuse.
An MVNO, usually online or by phone. Cheaper, but the sign-up flow is mostly in Korean. Some MVNOs have English support lines; check before committing.
The airport, on arrival. Convenient and priced accordingly. Fine as a bridge until your ARC arrives.
Things worth checking before signing
Contract length. 12 or 24 months is standard, with an early termination fee. If your visa is shorter than the contract, say so — some carriers offer contract terms matched to visa expiry, and signing a 24-month contract on a 12-month visa is a problem you create for yourself.
Whether the plan is handset-bundled. A cheap-looking monthly price often includes a handset instalment. Look for the split between plan cost and device cost.
Data policy after the cap. Most plans throttle rather than cut off, but the throttled speed varies enormously between plans.
What happens when you leave Korea. Cancelling requires visiting a store, and unpaid balances follow you into immigration and banking records. Do not simply stop paying and fly home.
The number that matters more than you think
Once you have it, your Korean number becomes your identity for practically everything:
- Banking apps and transfer authentication
- Delivery apps — most will not complete signup without it
- Taxi apps
- Government services and appointment booking
- Loyalty cards, which cashiers will ask about constantly
This is also why keeping the same number matters. Number portability is standard, so switching carriers keeps your number. Losing it — by letting a prepaid line lapse, for instance — means re-verifying every account you registered with it. It is a bad afternoon.
If you are still working out the running cost of all this, the Seoul cost-of-living breakdown puts the phone bill in context against rent and transport.
Verified August 2026. Plans, carrier requirements, and MVNO offerings change frequently. This is general information, not advice — see terms. If a carrier told you something different, let me know.
Frequently asked questions
Can I get a Korean phone number without an alien registration card?
Prepaid tourist SIMs work on a passport alone. A regular contract with a Korean number that services will accept generally requires an ARC, and most banking and delivery apps verify against a contract-backed number.
What is an MVNO and why is it cheaper?
MVNOs, called altteul phones in Korean, resell capacity on the three major networks at lower prices. Coverage is identical because it is the same physical network; what you give up is retail support and bundled perks.
Do I need a Korean phone number to use Korean apps?
For most of them, yes. Banking, delivery, taxi, and government apps authenticate by SMS to a Korean number, and a foreign number will not pass that check.
Can I keep my number if I change carriers in Korea?
Yes. Number portability is standard and the process is handled by the new carrier. You keep the number when moving between major carriers and MVNOs alike.