The best eSIM for Japan depends on your trip: how long you are staying, how much data you use, and whether Japan is your only stop. For a Japan-only holiday, a dedicated plan with nationwide coverage, hotspot and no ID step is the direct choice, while a multi-country plan makes more sense if you are continuing to South Korea, Taiwan or Southeast Asia. This guide explains what to compare, then matches our Japan travel eSIM plans to the most common itineraries.
What matters when choosing a Japan eSIM
Most Japan eSIMs look similar on a product page: a number of gigabytes, a number of days and a price. The differences that affect your trip sit in the details below, so it is worth checking each one before you buy from any provider.
Coverage
Tokyo and Osaka are easy for any network. The question is what happens on the Shinkansen, in rural onsen towns, in the ski resorts and on the islands. Look for a plan that states nationwide coverage and names the network it uses, so that you can judge it for the places on your itinerary. Our Japan eSIM has nationwide coverage from Hokkaido to Okinawa, including the Shinkansen routes between the big cities and resorts such as Niseko, Hakuba and Nozawa. As in any country, signal thins out on remote hiking trails, in deep valleys and on small outlying islands.
Network
Japan has four national mobile operators: NTT docomo, KDDI (sold under the au brand), SoftBank and Rakuten Mobile. Alongside them sit MVNOs, which are carriers that lease capacity on those national networks instead of building their own towers. A travel eSIM connects through one of these, and a clear listing tells you which. Our Japan eSIM connects through IIJmio, a long-established Japanese MVNO that runs on NTT docomo infrastructure. It is an IIJmio plan, not a docomo, au or SoftBank branded plan, with 5G where available and 4G LTE everywhere else. Our Asia Explorer eSIM uses Rakuten Mobile while you are in Japan.
Data size
Buy for how you actually use your phone. Heavy use of maps, translation and social apps averages roughly 1GB a day. Video streaming, video calls and laptop tethering push that figure up quickly, while messaging and navigation alone sit well under it. Also check what happens when the allowance runs out. Some plans stop completely. On our Japan eSIM, data continues at 256 kbps until the plan ends, which is enough for messaging and basic maps but not for video.
Validity
Validity is the number of days the plan runs, and the detail to check is when the clock starts. If it starts at purchase or at installation, you lose days before you arrive. Our Japan eSIM starts on the first network connection in Japan, and the 3, 7, 15 or 30 days are counted from that moment.
Hotspot
Not every travel eSIM allows tethering. If you plan to work from a laptop, connect a tablet or share data with a travel companion, confirm that hotspot is permitted. It is included on both of our plans that cover Japan and it uses your data allowance, so pick a larger size if you will tether regularly.
ID rules
Some eSIMs require you to upload a passport before they activate, depending on the destination and the local telecom rules. Our Japan eSIM has no passport registration or eKYC step. The Asia Explorer eSIM also needs no ID for Japan, but travellers using it in Hong Kong or Taiwan must complete real-name registration with a valid passport.
Multi-country use
A single-country plan stops working when you leave. That is fine for a Japan-only holiday, and it matters if your flight home includes a few days in Seoul or Taipei. Decide whether you want one regional plan for the whole journey or a separate eSIM for each country. Most recent phones can store several eSIMs and switch between them in settings.
Delivery and support
An eSIM should arrive by email as a QR code, with nothing to post and nothing to collect. Check how quickly it is sent, whether you can install it before you travel, and who answers if the installation fails. Our QR codes are emailed after purchase, usually within minutes, and our Melbourne-based support team is available 16 hours a day by live chat and email.
Our Japan eSIM plans compared
We offer two eSIMs that work in Japan. Prices are in Australian dollars and convert automatically at checkout if you shop in another currency.
| Feature | Japan eSIM (IIJmio) | Asia Explorer eSIM |
|---|---|---|
| Where it works | Japan only | Japan plus 11 more destinations |
| Network in Japan | IIJmio, 5G/4G | Rakuten Mobile, 4G/5G |
| Data sizes | 5GB to 50GB at full speed, then unlimited at 256 kbps | 3GB to 50GB |
| Validity | 3, 7, 15 or 30 days | 3, 7, 15 or 30 days |
| Calls and number | Data only, no phone number | Data only, no phone number |
| Hotspot | Included | Included |
| ID needed | No | Not for Japan. Passport registration for Hong Kong and Taiwan |
| Prices from | A$7.90 | A$5.90 |
The Japan eSIM is the dedicated option for a trip that stays inside Japan. The Asia Explorer eSIM covers Japan, South Korea, Taiwan, Hong Kong, Macau, Thailand, Vietnam, Malaysia, Singapore, Indonesia, Australia and New Zealand, with plans from 3GB for 3 days at A$5.90 up to 50GB for 30 days at A$61.90.
Which plan fits which trip
| Your trip | Plan to look at | Price |
|---|---|---|
| Long weekend in Tokyo or Osaka | Japan eSIM, 5GB for 3 days | A$7.90 |
| About a week, light use | Japan eSIM, 5GB for 7 days | A$9.90 |
| About a week, regular use | Japan eSIM, 10GB for 7 days | A$13.90 |
| Up to two weeks, light use | Japan eSIM, 10GB for 15 days | A$15.90 |
| Up to two weeks on the classic route | Japan eSIM, 20GB for 15 days | A$24.90 |
| Up to two weeks, heavy use or tethering | Japan eSIM, 50GB for 15 days | A$49.90 |
| A month in Japan | Japan eSIM, 30GB for 30 days | A$39.90 |
| A month with remote work or shared data | Japan eSIM, 50GB for 30 days | A$59.90 |
| Japan plus other Asian stops, about two weeks | Asia Explorer eSIM, 20GB for 15 days | A$25.90 |
| Japan plus other Asian stops, up to a month | Asia Explorer eSIM, 20GB for 30 days | A$27.90 |
One to two weeks on the classic route
Tokyo, Hakone, Kyoto, Nara, Osaka and Hiroshima is the itinerary most first-time visitors follow, and it involves a lot of navigation. At roughly 1GB a day for heavy use, 20GB for 15 days leaves a comfortable buffer. If you mostly use maps and messaging, 10GB for 15 days is enough.
Japan as one stop of several
If your route also takes in South Korea, Taiwan or Southeast Asia, the Asia Explorer eSIM keeps you on one plan across all of them. In Japan it connects through Rakuten Mobile rather than IIJmio, so for a Japan-only trip the dedicated Japan eSIM is the more direct choice. The alternative is to pair the Japan eSIM with a separate plan for your next stop, which you can find among our Asia eSIM plans.
How delivery and activation work
- Buy online. Choose your data size and number of days. The QR code is emailed after purchase, usually within minutes. Orders placed after 1 AM AEST are sent from 9 AM AEST onwards, so order at least a day before you fly.
- Install on Wi-Fi before you fly. Scan the QR code in your phone's mobile settings at home. The Japan eSIM can be installed any time before your travel date, but it must be installed and used within 60 days of purchase or the QR code expires and cannot be reissued.
- Land and connect. Switch on the eSIM line, set it as your mobile data line and turn on data roaming for it. Service starts automatically on the first network connection in Japan.
One difference to note: the Asia Explorer eSIM should be installed on arrival rather than at home if you live in or transit through one of its covered destinations, because it activates on first connection in any of them.
When a travel eSIM is not the right fit
An eSIM is not the answer for everyone, and it is better to find that out before you order.
- Your phone is locked or does not support eSIM. You need a carrier-unlocked, eSIM-compatible phone, which includes iPhone XS and newer, Google Pixel 3 and newer, and Samsung Galaxy S20 and newer. Dial *#06#, and if a 32-digit EID number appears, your phone supports eSIM.
- You need a Japanese phone number. Our plans are data only, with no phone number and no SMS. A local SIM with a voice contract can still suit long-term residents who need a Japanese number.
- You are connecting a large group. Hotspot works for a laptop or a travel companion, but a family with many devices may prefer a rented pocket Wi-Fi router.
- You expect to top up. The Japan eSIM cannot be topped up or extended. You can buy a second eSIM at any time and receive it by email.
If you are still weighing an eSIM against roaming, an airport SIM or pocket Wi-Fi, our guide to getting internet in Japan as a tourist compares all of the options side by side.
A quick checklist before you buy
- Is my phone unlocked and eSIM-compatible?
- Does the plan cover every country on my route, or only Japan?
- Does the validity cover my arrival day through to my departure day?
- Is the data size realistic for how I use my phone, including any tethering?
- Have I left at least a day between ordering and flying?
When you have the answers, compare sizes and trip lengths on our eSIM for Japan page.
Frequently asked questions
What is the best eSIM for Japan?
It depends on your trip. For a Japan-only holiday, our IIJmio Japan eSIM from A$7.90 has nationwide coverage, hotspot included and no ID registration, and 20GB for 15 days (A$24.90) suits most one to two week itineraries. If you are also visiting South Korea, Taiwan or Southeast Asia, the Asia Explorer eSIM covers Japan plus 11 more destinations on one plan.
Which network does the Japan eSIM use?
The Japan eSIM connects through IIJmio, a Japanese MVNO that runs on NTT docomo infrastructure, with 5G where available and 4G LTE everywhere else. The Asia Explorer eSIM uses Rakuten Mobile while you are in Japan.
How much data do I need for two weeks in Japan?
Heavy use of maps, translation and social apps averages roughly 1GB a day, so 20GB for 15 days fits most itineraries. Take 30GB or 50GB if you hotspot a laptop or stream video, and 10GB if you mostly use maps and messaging.
Is there an unlimited data eSIM for Japan?
Every Japan eSIM plan has a full-speed allowance from 5GB to 50GB. After that you keep unlimited data at 256 kbps until the plan ends, which is enough for maps and messaging but not for video.
Do I need a passport or ID to activate a Japan eSIM?
No. The Japan eSIM has no passport registration or eKYC step. The Asia Explorer eSIM also needs no ID for Japan, but travellers using it in Hong Kong or Taiwan must complete real-name registration with a valid passport.
Can I use the Japan eSIM in South Korea or Taiwan?
No. The Japan eSIM works in Japan only. For a multi-country trip, choose the Asia Explorer eSIM, which covers Japan, South Korea, Taiwan, Hong Kong, Macau, Thailand, Vietnam, Malaysia, Singapore, Indonesia, Australia and New Zealand.
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