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Getting a Korean SIM Card: 유심 vs 요금제

Written and reviewed by Jun and Jin, native Korean speakers

Published · Updated · How we write & review

After this page, you can get a Korean phone number and SIM card set up as a new arrival.

10-second answer

The short answer

Short-term visitors typically get a prepaid 유심 (yusim, USIM) at the airport or a convenience store — no ID or contract needed beyond a passport. Longer-term residents usually sign up for a 요금제 (yogeumje, monthly phone plan), which requires an 외국인등록증 (oegugindeungnokjeung, Alien Registration Card) and often a bank account. Airport kiosks, telecom stores (SKT/KT/LG U+), and budget MVNO brands (알뜰폰, altteulpon) are the three main routes.

Quick check — did that land?

  1. 1. What's the quickest option for a short-term visitor?

Need a Korean SIM card?

Full Dialogue Walkthrough

A quick prepaid SIM purchase, then a fuller monthly-plan signup. Try "Practice as You" and answer each line yourself before checking.

Practice as:
You

유심 사고 싶어요.

yusim sago sipeoyo.

I'd like to buy a SIM card.

Staff

여권 좀 보여 주세요.

yeogwon jom boyeo juseyo.

Please show me your passport.

You

일주일 쓸 거예요.

iljuil sseul geoyeyo.

I'll use it for a week.

See also: Opening a Bank Account in Korea

Three Ways to Get Connected

OptionBest forWhat you need
유심 (prepaid USIM/eSIM)Short trips, touristsPassport only — no contract, no bank account
요금제 (carrier contract)Residents, students, workers외국인등록증, often a Korean bank account
알뜰폰 (budget MVNO)Long-term residents wanting cheaper monthly ratesSame as 요금제, but through a discount reseller instead of SKT/KT/LG U+

The big three carriers are SKT, KT, and LG U+ — all offer both prepaid and contract options. 알뜰폰 brands run on the same networks at a fraction of the price, making them popular once you're settled.

An LG U+ phone shop in Jongno with a large pink U+ logo over the glass front (faces in window ads and a passer-by blurred)
An LG U+ store in Jongno. LG U+ is one of Korea's three big carriers, along with SKT and KT; their shops are easy to spot by the logo.

Free Wi-Fi on Seoul's Streets: SEOUL_Secure

A red-and-white sign on a street pole in Seoul reading 서울무료와이파이 Free WiFi, with the network name SEOUL_Secure, ID seoul and password seoul, and setup instructions for Android (EAP method PEAP, CA certificate: don't validate) and iPhone (certificate: trust) (a bystander's face blurred)
A 서울무료와이파이 (Seoul Free Wi-Fi) sign on a street pole. The ID and the password are both seoul.

A SIM or eSIM is still the easy answer, but Seoul also runs free public Wi-Fi on streets, in parks, at bus stops and on city buses. Since January 1, 2021, the network has been called SEOUL_Secure, and as the name suggests, it's encrypted — so you log in once with the ID and password printed on signs like this one: seoul and seoul.

  • Choose SEOUL_Secure in your Wi-Fi list.
  • Enter seoul as the ID (아이디) and seoul as the password (비밀번호).
  • On Android, set EAP method to PEAP and CA certificate to "Don't validate" (인증 안 함). On iPhone, tap Trust (신뢰) when the certificate appears.

It's handy for checking a map or a bus arrival time when your data runs out, but coverage stops the moment you walk away from a hotspot — and Seoul itself advises against banking or entering sensitive personal details on public Wi-Fi. That's why a Korean number is still worth having for anything longer than a few days.

KoreanRomanizationMeaning
무료muryoFree (of charge)
와이파이waipaiWi-Fi
아이디aidiID, username
비밀번호bimilbeonhoPassword
인증서injeungseoCertificate

Useful Phrases

유심 사고 싶어요.

yusim sago sipeoyo.

I'd like to buy a SIM card.

~고 싶어요 — the standard "I want" phrasing.

데이터 무제한 요금제 있어요?

deiteo mujehan yogeumje isseoyo?

Do you have an unlimited data plan?

무제한 = unlimited. 있어요? checks availability.

번호 그대로 쓸 수 있어요?

beonho geudaero sseul su isseoyo?

Can I keep my current number?

Relevant when switching carriers (번호이동, number portability).

Why a Korean Number Matters So Much

A Korean phone number isn't optional infrastructure here — it's the backbone of identity verification for banking, food delivery apps, KakaoTalk, and most online sign-ups. Getting a number early, even a basic prepaid one, unblocks almost everything else on a settling-in checklist.

Common Mistakes

Mistake #1 — Assuming a foreign SIM/eSIM works the same as a Korean carrier number

Many Korean apps and verification systems specifically require a domestic (010) number — a foreign roaming number often won't pass verification.

Mistake #2 — Signing a long 요금제 contract on day one without comparing 알뜰폰

Budget MVNOs run on the same towers for noticeably less — worth comparing once you're not in a rush.

Mini Quiz

2 short questions — about 1 minute

  1. 2. What does 알뜰폰 refer to?

  2. 3. Why do many apps require a Korean (010) number specifically?

Part of Everyday Korean: Phone Calls, Plans, Weather & Health

Part of Life in Korea: Practical Guides for Foreign Residents

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