Quick Answers

Question	Answer
Best option for most visitors	An eSIM bought before you fly, if your phone supports it
Typical cost for a week	About ₩10,000–50,000, depending on data and whether a Korean number is included
Do I need a Korean phone number?	Not for maps, translation or messaging apps. Only for some local apps and services that send SMS codes.
Where to buy a physical SIM	Mobile carrier counters and some convenience stores at Incheon Airport, or online for airport pickup
What to check first	That your phone is carrier-unlocked

Step 1: Check Your Phone Is Unlocked

A Korean SIM or eSIM only works if your phone is not locked to your home carrier. Check this before you buy anything.

• iPhone: Settings → General → About → Carrier Lock. It should say “No SIM restrictions”.
• Android: the menu differs by brand, so the quickest way is to ask your home carrier.

While you are there, check whether your phone supports eSIM. Most iPhones from the XS onward and many recent Samsung Galaxy and Google Pixel models do.

Step 2: Choose eSIM, SIM or Roaming

	eSIM	Physical SIM	Roaming
How you get it	Buy online, install with a QR code	Pick up at the airport or a store	Turn on a plan from your home carrier
Keep your home number active?	Yes, on dual-SIM phones	No, unless your phone has two slots	Yes
Setup effort	Easy, done before you fly	Easy, staff can help at the counter	Easiest
Usual cost	Low to medium	Low to medium	Often the most expensive
Best for	Most travelers with a recent phone	Phones without eSIM, or if you want help in person	Short trips, or when your carrier’s Korea plan is cheap

Our recommendation: choose an eSIM if your phone supports it. Buy it a few days before your trip, install it at home on Wi-Fi, and turn it on when you land. If your phone doesn’t support eSIM, pick up a physical SIM at Incheon Airport.

How Much Data Do You Need?

How you use your phone	Rough daily use	Plan to look for
Maps, translation, messaging, a little browsing	Under 1 GB	About 1 GB per day, or a fixed total like 5–10 GB for a week
All of the above plus regular social media posts and photos	1–2 GB	2–3 GB per day
Video streaming, video calls, or sharing a hotspot with a travel partner	3 GB or more	Unlimited

Good to know:

• Navigation uses less data than you might think. Video and uploading photos use the most.
• “Unlimited” often means a daily high-speed allowance, after which speed drops. Check the fair-use limit in the plan details.
• Sharing with a partner? Make sure the plan allows tethering (hotspot) before you buy.

Data-Only or With a Korean Number?

Most tourist plans are data-only. That is enough for Naver Map, translation apps, WhatsApp, LINE, KakaoTalk and browsing.

Choose a plan with a Korean number if you want to:

• Make local calls to restaurants or guesthouses
• Sign up for Korean apps that need SMS verification, such as some taxi, delivery or booking apps
• Receive SMS codes from Korean websites

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How to Set Up an eSIM

1. Buy your plan from the provider’s website or app. You will receive a QR code by email.
2. At home, on Wi-Fi: go to your phone’s mobile/cellular settings and choose “Add eSIM”, then scan the QR code.
3. Label the new line (for example “Korea”) so you can tell your lines apart.
4. After landing: set the Korea line as your mobile data line and turn on data roaming for that line if the provider says to.
5. Turn off data roaming on your home line to avoid charges from your home carrier.

Some plans start counting days from installation, others from first connection in Korea. Read your plan’s activation rule before installing it too early.

Getting a Physical SIM at Incheon Airport

If your phone doesn’t support eSIM, pick up a tourist SIM when you land:

• Where: counters of Korea’s main carriers — SK Telecom, KT and LG U+ — are in the arrivals hall at both terminals. Staff will usually insert and test the SIM for you.
• Bring your passport. Korean SIM purchases require it.
• Keep your home SIM safe — a small zip bag or the backing card from your new SIM works well.

Before you leave the terminal, whichever option you chose, check that mobile data works, your map app can show your route to the hotel, and your hotel address is saved — ideally in Korean too. If anything isn’t working, sort it out at the carrier counter first; it is much harder once you are on a train. → Incheon Airport to Seoul

If Your Data Doesn’t Work

1. Turn airplane mode on for 10 seconds, then off.
2. Restart your phone.
3. Check that the Korean SIM/eSIM is selected for mobile data.
4. Check data roaming is on for the Korean line if your provider requires it.
5. Check the APN settings in your provider’s instructions.
6. Confirm your plan has started and has not expired.
7. Contact the provider with your order number ready.

Other Ways to Stay Connected

• Free public Wi-Fi is available in many subway stations, buses and public spaces in Seoul. Look for networks named “Seoul” or “Public WiFi Free”. It is handy as a backup but not reliable enough to replace mobile data.
• Pocket Wi-Fi routers can be rented at the airport. They make sense for groups sharing one connection, but you have to keep the device charged and carry it everywhere.

Useful Apps to Install Before You Go

• Naver Map or Kakao Map — the most detailed maps in Korea, with subway exits and walking routes
• Papago — a Korean-made translation app that handles menus and signs well
• KakaoTalk — used by most Korean businesses and guesthouses for messaging

Our own Korean Image Search and Seoul Subway Route Finder run in your browser and need only a data connection.

Official Carrier Pages

• SK Telecom Roaming
• KT Roaming
• LG U+ Korea SIM

Related Guides

→ Seoul travel tips for first-time visitors · Seoul travel budget · Electricity & plugs in Seoul

Plans, prices and activation rules change. We check this page regularly, but please confirm the details with your provider before purchasing.

A Local’s Note

Why I’d Go with an eSIM

If it were me, I’d go with an eSIM. Just to be clear, this is my personal opinion, but let me walk you through a few reasons why.

eSIMs for Korea run on the networks of the three major carriers: SKT, KT and LG U+. That means you get the big advantage of unlimited data at 5G speeds, and you never have to bother swapping out a physical SIM card.

So while you’re traveling in Korea, you can look up restaurants, find your way around with Google Maps or Naver Map, and check out the latest pop-up stores without worrying about your data.

You can activate it the moment you land and enjoy fast, convenient 5G right away.

A few things to check first

• Make sure your phone supports eSIM. Some older models don’t.
• Set it up on Wi-Fi. I recommend doing the initial setup while connected to Wi-Fi, since you’ll need a stable internet connection.