[Korea Travel] Roaming Guide | How to Use Local SIM & eSIM

Roaming Guide 

How to Use Local SIM & eSIM

Planning a trip to Korea? If you want to use Naver Maps, KakaoTalk, Instagram, and find café reviews right after you land, having a fast and reliable internet connection is a must.

 

Korea has an excellent telecommunications infrastructure, offering a wide range of SIM and eSIM options for travelers.
In this post, we’ll guide you through everything you need to know about SIM and eSIM roaming services for visitors to Korea.

Roaming - SIM & eSIM

 

For an affordable and fast alternative to international roaming during your trip to Korea, sign up for a local SIM or eSIM and enjoy your travels without worrying about data.

 

1. How to Purchase a SIM or eSIM

The most convenient way is to purchase a SIM card or eSIM right after arriving at Incheon Airport. You can also buy it in advance through the mobile carrier's website and pick it up when you arrive at the airport.
Please check the available dates and prices on the carrier's website and consider making a reservation beforehand.

Where can you buy it?

• At both Terminal 1 and Terminal 2 arrival halls, you’ll find booths for major telecom providers such as SKT, KT, and LG U+.
• Online reservation is available, with pickup at the airport upon arrival.
• You can also purchase SIM cards from convenience stores (like CU and GS25), SIM vending machines, or Wi‑Fi router rental counters within the airport.

What options are available?

• Prepaid SIM cards (physical SIMs): Choose from data-only plans or plans that include voice and text services.
• eSIMs: Activate your mobile plan easily by scanning a QR code—no need to remove your physical SIM.
• Wi‑Fi egg (portable Wi‑Fi device): Ideal for travelers with multiple devices or traveling in groups.

Airport roaming counter

2. SIM vs eSIM 

Installation Method	Remove existing SIM and insert new one	Activate via QR code in phone settings
Speed	Supports LTE/5G	Supports LTE/5G
Device Requirement	Unlocked phone	Unlocked phone with eSIM support
SIM Storage Issue	Need to store old SIM when replacing	Can keep physical SIM in the pho

※ Most modern smartphones (iPhone XS and newer, recent Android models) support eSIM.

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3. Korean Mobile SIM Services

SKT (T world)

• Unlimited data + Korean phone number
• Available as both eSIM and physical SIM (USIM)
• https://www.skroaming.com

KT (Olleh)

• Offers SIM cards and portable Wi‑Fi (Wi‑Fi egg) rentals
• eSIM QR codes available via online reservation or at the booth
• T-money transportation card provided (rechargeable and ready to use)
• https://roaming.kt.com

LG U+

• Prepaid SIM cards designed for foreigners
• Free incoming text messages, can receive calls
• https://www.lguplus.com/korea-sim

 

4. What You Need to Purchase

• Passport: Required for foreigner registration
• Unlocked phone: Your device must be unlocked to use Korean SIM cards
• Credit card or cash: Some booths may not accept international cards, so it’s best to have cash ready just in case

 

5. How to Activate (eSIM Example)

1. On your phone: Go to Settings → Cellular / Mobile Data → Add eSIM
2. Scan the QR code provided by the booth
3. Turn on Data Roaming
4. Check your Korean phone number and start using the service!

※ If you run into any issues, booth staff can assist with setup on the spot.

 

6. FAQ

Q: I want to keep using my US number. Can I still use a Korean SIM?
Yes! You can install a Korean eSIM and keep your US number in the physical SIM slot.

 

Q: Will I lose my KakaoTalk account if I change my number?
No worries. Your KakaoTalk account stays active even if your phone number changes.

 

Q: Is "unlimited data" truly unlimited?
 Most plans have a fair usage policy. After using 3~5GB in a day, speeds may be reduced.

 

Extra Tips

• Booking in advance can be cheaper than purchasing at the airport, so consider buying ahead of time.
• eSIM is especially recommended it’s fast, convenient, and you don’t need to remove your existing SIM card.
• If you arrive late at night, use SIM vending machines (located near the arrival hall) or convenience stores like CU.
• The SIM card packaging and user guide include important information such as your Korean customer service number and PIN.

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Thanks to Korea’s fast and reliable internet infrastructure, travelers can easily access online information anytime, anywhere during their trip.

By choosing the right SIM or eSIM option, you can enjoy apps like KakaoTalk, maps, and translators without worrying about expensive roaming fees.

 

I hope this post helps you prepare for your trip to Korea. Wishing you a wonderful journey filled with great memories!

 

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