Last checked: 24 October 2026
A newcomer to South Korea needs a passport to start a prepaid line straight away, but a monthly contract needs a residence card (ARC) and a Korean bank account, which can take a month or more. Until then, a data only eSIM keeps you online from landing day, and you keep your home SIM for calls and bank codes.
South Korea SIM card for international students: what you need
The short answer: a passport gets you a prepaid line on arrival, while a monthly contract waits on your residence card and a Korean bank account. Plan for prepaid or a travel eSIM for your first month.
What the documents are for:
- Passport: Invest KOREA says a passport is required for immediate connection to prepaid service. Foreign passports are accepted.
- Alien registration card (now called a residence card, ARC): needed for a postpaid subscription.
- Korean bank account or credit card in your own name: needed for monthly contract payment. Invest KOREA notes payment must come from an account or card in the subscriber's name.
Where to buy prepaid:
- Airport carrier counters for SK Telecom, KT and LG U+.
- Carrier shops or convenience shops in cities. Guides say airport kiosks often have fewer plan choices.
Prepaid has no two or three year contract and suits short stays, per Invest KOREA. Short term and student prepaid packages of up to 90 days are sold through travel platforms, according to third party guides. See the South Korea plan page for data options.
Prepaid SIM or monthly contract: which comes first
Prepaid comes first for almost everyone. A monthly contract only becomes practical once the ARC and a Korean bank account exist, because each one is checked against the other.
How the two compare:
- Prepaid: passport only, no long contract, sold at airport counters and shops. Good for the first weeks and for short stays.
- Monthly contract: needs the ARC, your passport and a Korean bank account or credit card in your own name for payment.
- Budget MVNO plans: third party guides say these run on the big three networks (SK Telecom, KT, LG U+). Bank linked MVNO plans become an option once you have an ARC and a bank account.
Invest KOREA says foreigners follow the same sign up steps as citizens, but the number of devices, instalment eligibility and deposit exemption depend on sojourn status. Your carrier will confirm what applies to you.
How long the paperwork takes
Budget three to four weeks for the residence card after you apply, and treat the bank account as a separate step that may be limited until the card arrives.
Timings from the facts:
- Alien registration (ARC): apply within 90 days of entry if you are staying more than 90 days, by HiKorea appointment. The card is issued about three to four weeks after the application date (university figure).
- Bank account: possible before the ARC with a passport, but mobile and internet banking may be restricted until the ARC arrives. Exact limits vary by bank and are not confirmed per bank, so ask your branch.
- Toss Bank: says you can sign up with an ARC and an NFC e passport if you do not yet have a Korean number.
For visa or residence eligibility, check the official immigration source rather than relying on a guide.
Your first 30 days in South Korea: a timeline
The first month is a chain: land, get a prepaid line, book your ARC appointment, open a bank account, then move to a contract once the card is in hand.
A practical order:
- Arrival day: buy a prepaid SIM at an airport carrier counter with your passport, or activate a data eSIM you installed before flying.
- First week: book the HiKorea appointment for alien registration if you are staying more than 90 days.
- First weeks: open a bank account with your passport. Expect mobile and internet banking limits until the ARC arrives.
- Weeks three to four: collect the ARC about three to four weeks after applying.
- After the ARC: update your details with your bank and carrier so they match the card, as third party guides advise, then consider a monthly contract or a bank linked MVNO plan.
Keep the prepaid line or eSIM running throughout so nothing depends on a number you do not have yet.
Staying connected until your local plan is ready
A data only eSIM covers the gap between landing and your first local plan. It needs no Korean ID, no shop visit and no contract, and it can be installed before you fly.
How it works:
- Slashtel eSIMs are data only: no local phone number and no calls or SMS. WhatsApp and other internet calls work over the data.
- Buy online with an email address and a card, Apple Pay or Google Pay. The QR code arrives by email within minutes.
- Validity starts when the eSIM first connects at the destination, so you can buy and install it at home before the flight.
- The network is chosen automatically and cannot be picked by hand.
- More data can be added to the same eSIM later, with no new QR code.
- Your phone must be unlocked and eSIM compatible. Check with the compatibility guide and the install guide.
Data options run from 1 GB to 50 GB. A 5 GB plan is $4.89, and you can size it with the data calculator.
Getting a local number for your bank and admin
A local number matters for banking and admin, because banks prefer a Korean number registered to your ARC. A prepaid local SIM gives you that number; the Slashtel eSIM does not.
When you need one:
- Opening or upgrading a bank account, and enabling mobile and internet banking once the ARC arrives.
- Registering with your university, employer or landlord where a Korean contact number is requested.
- Receiving verification codes by SMS from Korean services.
How to get it:
- Buy a prepaid SIM with your passport at a carrier counter or shop. This gives a real Korean number.
- Once you have the ARC and a bank account, ask about a monthly contract or a bank linked MVNO plan.
Keep your home SIM in the phone for calls and bank codes from home, and turn off data roaming on it to avoid roaming charges. See calls, texts, OTPs and data for how the two SIMs work together.
When family visits you in South Korea
Visiting family can stay online with a data eSIM bought before they travel, and you can arrange it for them without them doing anything technical.
What to do:
- You buy the eSIM and enter the visitor's email, so the QR code goes straight to the person who will use it.
- They install it at home before the flight; validity starts when it first connects in South Korea.
- It is data only, so they use WhatsApp and internet calls over the data rather than local calls or SMS.
- Check their phone is unlocked and eSIM compatible first.
A prepaid SIM bought on a passport at an airport counter is the alternative if a visitor needs a Korean number for calls or SMS. For a short trip, a data eSIM is usually simpler. Start from the South Korea plan page.
Keeping your home number active
Keep your home line alive while you settle, because bank codes and account recovery often go to the number you registered at home.
How to manage it:
- Keep the home SIM in the phone and turn off data roaming on it to avoid roaming charges.
- If your home line is prepaid, top it up so it does not lapse. Slashtel sells mobile top ups to more than 100 countries, delivered in minutes, which keep a prepaid home line active.
- Use the eSIM for data and the home SIM for incoming codes and calls.
See keep your number active and the top up page for the mechanics. Once your Korean number is working for banking, you can decide whether to keep the home line.
First-week catches to avoid
The main trap is the loop between phone, bank and ARC: each step wants the others finished first. Plan around it rather than fighting it.
What to watch:
- The dependency loop: postpaid needs an ARC and a Korean bank account, and banks prefer a Korean number registered to your ARC. Stay on prepaid or a travel eSIM for the first month or more.
- The ARC wait: expect three to four weeks after applying before the card arrives.
- Details that must match: after the ARC is issued, update your details with your bank and carrier so they match the card.
- Airport kiosks: guides say they often have fewer plan choices, so compare with city shops.
- Carrier eSIMs: third party guides say SK Telecom, KT and LG U+ sell tourist data plans that can be eSIM, but whether each carrier sells eSIMs directly to foreigners without Korean ID is not confirmed on the carriers' own pages. Ask the operator.
- Online carrier eSIM ID rules: third party guides conflict on whether a carrier eSIM ordered online needs a passport, so that point is not confirmed. The operator will confirm.
For the wider move, see moving abroad.
FAQ
Quick answers to the questions newcomers ask most about SIM cards, phone plans and staying connected in South Korea.
Use the questions below for the details that change fastest, and confirm anything about IDs, eligibility or carrier eSIM rules with the operator or the official site.
Sources
Checked 2026-10-24. Rules and waiting times change, so check the official sites before you rely on them.
- Invest KOREA (KOTRA): https://www.investkorea.org/ik-en/cntnts/i-431/web.do
- Sogang University: https://scc.sogang.ac.kr/wwwe/foreigner.html
- Seoul National University: https://oia.snu.ac.kr/node/193
- Hanam City: https://www.hanam.go.kr/english/contents.do?key=9641
- Toss: https://toss.im/tossfeed/article/korealifehacks-7-en
- enko (third party): https://stay.enko.kr/blog/opening-bank-account-south-korea
- Jobploy (third party): https://www.jobploy.kr/en/content/STO0000000151
Questions, answered
Can I get a phone plan in South Korea without an alien registration card?
Not a monthly contract. Invest KOREA says a postpaid subscription needs an alien registration card (residence card, ARC). With a passport you can start a prepaid line immediately, which covers your first weeks until the ARC arrives.
Is a prepaid SIM South Korea option available at the airport?
Yes. Airport carrier counters for SK Telecom, KT and LG U+ sell prepaid SIMs, and a foreign passport is accepted. Guides say airport kiosks often have fewer plan choices than city shops, so compare if you have time.
How long does it take to get a residence card before I can sign a contract?
Apply within 90 days of entry if you are staying more than 90 days, by HiKorea appointment. The card is issued about three to four weeks after the application date, according to a university figure, so plan for prepaid or an eSIM for the first month.
Do I need a South Korea bank account for a monthly phone plan?
Yes for a standard monthly contract. Invest KOREA says payment must come from a bank account or credit card in the subscriber's name. You can open an account with a passport, but mobile and internet banking may be restricted until the ARC arrives.
Can I use an eSIM South Korea plan while I wait for my local number?
Yes. A Slashtel eSIM is data only, with no local number and no calls or SMS, and it works over the mobile network from landing day. WhatsApp and other internet calls work over the data, so you stay reachable while your paperwork is processed.
Does a Slashtel eSIM give me a Korean phone number for banking?
No. It is data only, with no local phone number and no calls or SMS. For banking and admin you need a local number, which a prepaid local SIM bought with your passport provides. Keep the eSIM for data and the local SIM for codes.
Can I get a SIM card for parents visiting South Korea?
Yes. You can buy a Slashtel eSIM and enter the visitor's email, so the QR code goes straight to the person who will use it. They install it before flying and it activates on first connection in South Korea. It is data only, so they use internet calls.
How much data should I buy for my first weeks in South Korea?
It depends on maps, messaging and video calls. Options run from 1 GB to 50 GB, and a 5 GB plan is $4.89. You can add more data to the same eSIM later with no new QR code, and the data calculator helps you size it.
Will my phone work with a South Korea eSIM?
Your phone must be unlocked and eSIM compatible. Check the compatibility guide before buying, and install the eSIM at home before the flight. Validity starts when it first connects at the destination, so early installation costs you nothing.
How do I keep my home number active after moving to South Korea?
Keep the home SIM in the phone for calls and bank codes, and turn off data roaming on it to avoid roaming charges. If it is prepaid, top it up so it does not lapse. Slashtel sells mobile top ups to more than 100 countries, delivered in minutes.