South Korea China Japan

South Korea China Japan eSIM for South Korea China Japan

Stay connected from the moment you land with an eSIM for South Korea China Japan. Affordable plans, no roaming surprises, no SIM shop queues.

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Plan:

$6.00

Instant delivery Secure checkout 24/7 support
  • Instant delivery: your eSIM arrives by email straight after checkout
  • Full-speed 4G/5G data across South Korea, China and Japan on China Unicom, KDDI/au, LG U+ and SKTelecom networks
  • Top up anytime without switching eSIMs
  • No physical SIM and no roaming fees
  • Unused data can be redeemed as store credit through Leftover Data Redemption

Stay connected across South Korea, China and Japan with fast, reliable 4G and 5G coverage. Whether you're exploring Seoul, walking the Great Wall in China, or wandering Tokyo, our eSIM for South Korea, China and Japan keeps you online with no roaming fees or physical SIM cards to worry about.

Ideal for travellers doing a multi-country East Asia trip who want smooth navigation, social media, work apps, video calls and streaming on the go, all powered by China Unicom, KDDI/au, LG U+ and SKTelecom.

Need standard calls & SMS? Add our Global Voice Pass to get an Australian mobile number for unlimited calls & SMS to selected destinations, while your data continues running on your South Korea, China and Japan eSIM.

  • Pre-Activation Days: Activate anytime within 180 days of purchase
  • Data Exit Country: Hong Kong
  • Hotspot & Tethering: Supported, share data with other devices
  • Speed: Full-speed 4G/5G, no reduction
  • Top-Up: Available anytime without switching eSIMs
  • Calls & SMS: Data-only. Use VoIP apps like WhatsApp or FaceTime, or add Global Voice Pass for a dedicated number
  • Networks: China Unicom, KDDI/au, LG U+ and SKTelecom (5G)
  • Coverage: South Korea, China and Japan
  • Compatibility: Requires an and unlocked device.

3 countries and territories included in this plan:

How to get an eSIM for South Korea China Japan

How to use the JusteSIMs eSIM service in three easy steps.

Choose your plan

Pick the data and days that suit your trip, right above. Make sure to check your device is .

1

Follow the installation steps

Your eSIM lands in your inbox instantly. Follow the simple steps and it's installed in minutes.

2

Connect from touchdown

Switch your eSIM on when you land and you're online. It's that easy!

3
Choose Your Plan

Check compatibility

What you need to check

To use a JusteSIMs eSIM, make sure you check the following off:

  • Your device supports eSIMs
  • Your device is unlocked from the carrier
  • Your device is not jailbroken (iOS) or rooted (Android)

iPhones bought in mainland China, and some bought in Hong Kong and Macao, don't support eSIMs.

Search for your device below to check if it supports eSIMs.

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Don't see your device?

We keep this list up to date, but it's not exhaustive. Check with your phone manufacturer if they support eSIMs.

Why you should choose the JusteSIMs eSIM for South Korea China Japan

No roaming bills. No airport SIM hunt. Just data that works the moment you land.

  • Instant delivery

    Your eSIM lands in your inbox the second you check out. No queues, no kiosks, no post.

  • 140+ countries covered

    From Tokyo to Toronto, our eSIMs keep you connected in over 140 countries, no matter where the trip takes you.

  • No roaming charges

    This eSIM is prepaid, so there's no surprise roaming bill waiting for you when you get home.

  • No physical SIM

    Nothing to insert, lose, or leave at home. Pack your passport and go, wherever you're headed.

  • Up and running in minutes

    Open the email, follow the steps, and your eSIM is installed before you've left the gate.

  • You're never traveling alone

    Wherever you land, our team is a message away by email or chat.

Why travelers choose the JusteSIMs eSIM for South Korea China Japan

  • Wow, this was so seamless. First time using an eSIM abroad and way cheaper than an international phone plan. The 5G in Thailand was so fast, I streamed Netflix and had FaceTime calls in real time.

    Jonathan J.Fast, reliable 5G in Thailand

  • This was the first time I'd used an eSIM. After a few simple changes to my phone's settings, I had it up and running. It was perfect for my short trip, especially for maps and translation apps. I'll always use an eSIM from now on.

    Douglas H.Easy setup for first-time eSIM users

  • The travel sim worked great with fantastic coverage in China, as did the calling service. Will definitely use this again.

    Rajesh P.Fantastic esim coverage in China

  • I bought a data esim for a week's holiday in Malaysia. The data plan worked as soon as I landed. I used it mainly for WhatsApp messages and calls. All worked very well with good speed. I recommend this product and will use this company again.

    Siau TehEsim to Malaysia worked seamlessly

  • We've come to enjoy the reliability and value of JusteSIMs. We navigated through Vietnam, Thailand, Malaysia, and Singapore with fast connections and great download speeds. Thanks to the team for being there when we needed help, with super-fast resolution.

    DWFast connections across 4 countries

100% money back guarantee

We want you to travel without worry, and that starts before you even board the plane.

Trip cancelled or delayed?

If you haven't activated your eSIM yet, we'll refund you in full. Just reach out!

Device not supported?

If your device is not eSIM compatible, we'll give you a full refund.

Not connecting on arrival?

Contact us within 48 hours and we'll investigate. You may be eligible for a full or partial refund, or a replacement plan.

Choose Your Plan

Our guarantee, in full

We want you to travel without worry, and that starts before you even board the plane.

Trip cancelled or delayed

If your plans change before you've activated your eSIM, contact us and we'll refund you in full. No hoops, no restocking fee. Our eSIMs are valid for 180 days from purchase, so if you're just delayed, you may not even need a refund.

Device not compatible

If your phone turns out not to support eSIMs, we'll give you a full refund, even after purchase. Just reach out before activating. You can check if your device is compatible here: .

eSIM activated but not connecting

If your eSIM isn't working, contact us within 48 hours of activation, or within 24 hours if you're on a 1 or 3 day plan. We'll investigate and, depending on the situation, you may be eligible for a full or partial refund or a replacement plan.

Coverage in very remote or rural areas may be limited regardless of provider. We'll always be upfront about this, but it falls outside our refund eligibility.

Activated plans

Once your eSIM has been activated and is working, we're unable to offer a refund. If you've used all your data and need more, contact us and we'll top up your plan without you needing to buy a new eSIM. If you're having trouble connecting after activation, contact us and we'll do our best to help.

To request a refund, contact us at support@justesims.com with your order number.

If we're unable to resolve your complaint, you can contact the Telecommunications Industry Ombudsman (TIO) at tio.com.au, a free, independent dispute resolution service.

Our goods and services come with guarantees that cannot be excluded under the Australian Consumer Law.

Frequently asked questions about eSIMs for South Korea China Japan

Will an eSIM work on my phone?

Most phones released since 2018 support eSIM, including recent iPhone, Samsung Galaxy, and Google Pixel models. Check if your device is , and make sure it's carrier-unlocked.

What's the best eSIM for South Korea China Japan?

The best eSIM for South Korea China Japan depends on your trip length and how much data you use. JusteSIMs plans are delivered straight to your inbox in seconds. Every plan comes with a 100% money-back guarantee, prepaid pricing with no roaming surprises, and real support if you need it. Pick the data and days that match your itinerary, right above.

How much does an eSIM for South Korea China Japan cost?

Plans for South Korea China Japan start from $6.00, depending on how much data and how many days you need.

Can I buy an eSIM for South Korea China Japan before I travel?

Yes. Buy anytime and activate whenever you're ready. Your plan's validity period starts on activation, not at purchase, so buying early doesn't cost you any data days.

How do I avoid roaming charges in South Korea China Japan?

Turn off data roaming on your regular SIM and switch to your JusteSIMs eSIM instead. It's prepaid, so there's no surprise bill waiting when you get home.

When should I install my South Korea China Japan eSIM?

Install it before you fly, while you're still on stable WiFi at home. That part's always safe. But for multi-country and Global plans like this one, activating starts your data countdown right away, even before you connect to a network, so don't switch data roaming on until you're actually ready to start using your days. Your eSIM stays valid for 180 days from purchase, so it's fine to install it well ahead of your trip. Just wait to activate until you land.

Why isn't my eSIM connecting?

Check that data roaming is turned on for the eSIM line and that airplane mode is off. Still stuck? Contact us and we'll investigate.