Planning a trip to South Korea? One of the smartest things you can do before you fly is set up an eSIM. It saves you the hassle of finding a SIM card at the airport, and you'll have data the moment you land.
This guide covers everything — what an eSIM is, how to set it up, when to activate it, and tips for getting the best experience in Korea.
What is an eSIM?
An eSIM (embedded SIM) is a digital SIM card built into your phone. Instead of inserting a physical SIM, you scan a QR code and your phone connects to a mobile network automatically.
For travellers, this means you can keep your home SIM active for calls while using a separate eSIM for data — perfect for Korea.
eSIMs are data-only plans. You'll still receive calls and texts on your regular number, while using the eSIM for internet access.
Does My Phone Support eSIM?
Most modern smartphones support eSIM. Here's a quick reference:
| Device | eSIM Support |
|---|---|
| iPhone XS and later (2018+) | ✔ Yes |
| iPhone 14 and later (US models) | ✔ eSIM only |
| Samsung Galaxy S20 and later | ✔ Yes |
| Google Pixel 3 and later | ✔ Yes |
| Older Android (pre-2019) | ✗ Usually No |
Your phone must be carrier-unlocked to use a foreign eSIM. If you bought your phone directly from Apple or Samsung (not through a carrier), it's almost certainly unlocked.
Step-by-Step: How to Set Up Your Korea eSIM
Purchase your eSIM plan
Choose a plan on roamiekim.com based on your trip length and data needs. You'll receive a QR code by email within minutes.
Open your email and save the QR code
Check your inbox for the Roamie Kim confirmation email. Screenshot the QR code or keep the email handy.
Install the eSIM on your phone
iPhone: Settings → Cellular → Add eSIM → Use QR Code
Android: Settings → Network & Internet → SIMs → Add eSIM
Scan the QR code. Your phone will install the eSIM — this takes about 30 seconds.
Keep the eSIM turned OFF until you arrive
The data plan starts counting from the moment you activate it in Korea. Install it before you fly, but leave it switched off until you land.
Activate when you land in Korea ✈️
Turn on the Roamie Kim eSIM as your data line. Within a few seconds, you'll be connected to Korea's 5G/LTE network.
Set the eSIM as your data line and keep your home SIM as your voice/calls line. This way you stay reachable on your regular number while enjoying fast Korean data.
Which Network Will I Connect To?
Your Roamie Kim eSIM connects to South Korea's major networks — SKT, KT, and LGU+. These cover virtually all urban areas, tourist spots, subway stations, and popular destinations including:
- Seoul (Gangnam, Hongdae, Itaewon, Myeongdong)
- Busan (Haeundae Beach, Gamcheon Village)
- Jeju Island
- Gyeongju, Sokcho, and Gangwon
Coverage may be limited in very remote mountain areas or deep underground — but for standard travel, you'll be well-connected everywhere.
Which Plan Should I Choose?
- Lite (5GB / 7 days) — Perfect for short trips. Maps, messaging, and light browsing.
- Essential (10GB / 7 days) — Great for Seoul travellers. Streaming, navigation, social media.
- Plus (20GB / 10 days) — Most popular plan. Ideal for most travellers.
- Unlimited (Unlimited / 15 days) — Unlimited high-speed data for heavy users.
- Local (Unlimited / 30 days) — Best for long stays, working holiday & exchange students.
Frequently Asked Questions
Can I use my home number with an eSIM?
Yes! Your regular SIM stays active for calls and texts. The eSIM is used for data only. You can receive calls and messages on your normal number while browsing on Korean data.
What if I run out of data?
You can purchase a new eSIM plan from roamiekim.com and install it on your device. We recommend the Plus or Unlimited plan if you expect to use a lot of data.
Can I share the eSIM QR code with someone else?
No — each QR code is single-use and device-specific. Sharing it will cause it to stop working. Each traveller needs their own eSIM.
Do I need WiFi to install the eSIM?
Yes, you need an internet connection to download the eSIM profile. We recommend installing it at home before you travel — it only takes a minute.
Ready to stay connected in Korea?
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