- Check your phone is eSIM-compatible and carrier-unlocked.
- Pick a data plan for the number of days you're staying — unlimited plans are popular.
- Install it before you fly while you're on Wi-Fi, then switch it on when you land.
Out exploring Jeju — you'll want maps working the whole way. Filmed by me for my YouTube channel, PROMISELAND.
1. Will an eSIM work on my phone?
Most recent iPhones, Google Pixels and Samsung Galaxy phones support eSIM. Your phone must also be unlocked — if it came on a contract, check with your home carrier. On iPhone go to Settings → General → About and look for "Digital SIM"/"Available SIM"; on Android search settings for "eSIM".
2. eSIM vs physical SIM vs pocket Wi-Fi
| Option | Pros | Cons |
|---|---|---|
| eSIM | Instant, no pickup, keep your home SIM | Needs a compatible phone; usually data only |
| Physical SIM | Works on older phones; some include a Korean number | Pickup at the airport counter |
| Pocket Wi-Fi | Shares with a group | Another device to charge and return |
3. Do I need a Korean phone number?
Most travellers don't. Data-only plans are enough for Naver Map, KakaoMap, Papago and messaging apps. A local number helps for some Korean apps such as Kakao T taxi booking and some delivery apps — if that matters to you, choose a plan that includes one.
4. How to install it
- Buy your plan and open the confirmation email or app.
- Scan the QR code (or use in-app install) while on Wi-Fi at home.
- Label it "Korea" and leave it switched off.
- When you land, turn on the Korea line, set it for mobile data, and enable data roaming for that line.
Compare data allowances and prices for your trip length.
See Korea eSIM deals →5. Tips for Jeju
Coverage is good across Jeju, including the coast roads and Udo; it can be patchy high on Hallasan. Google Maps won't give driving directions in Korea, so download Naver Map or KakaoMap before you go — especially if you're renting a car.
FAQ
Does an eSIM work in Jeju?
Yes. Korean networks cover Jeju well, including the coast and Udo.
When should I install my Korea eSIM?
Before you fly, while you're on Wi-Fi. Then switch it on after landing.
Can I keep WhatsApp on my home number?
Yes. Your home SIM stays in the phone, so WhatsApp keeps your usual number while the eSIM provides data.
Is unlimited data worth it?
If you use maps, video calls or social media a lot, unlimited plans remove the worry. Light users can save with a smaller plan.
I'm Promise, a teacher living in Jeju. I film walking tours around the island and write these guides from what I've learned getting around myself. Follow along on YouTube and Instagram.