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We tested the best eSIMs for Japan for when you need great coverage and connection while roaming across Asia
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The best eSIM for Japan is essential if you need to stay connected from the moment you touchdown. For me, the top services are those that are easy to setup on your device, offer excellent coverage, and a broad range of data plans to meet your needs, whether you're taking a short business trip in Tokyo or staying for longer periods to visit family and friends.
Because of that, Ubigi is the best eSIM overall when traveling to Japan. In our in-depth review, we found it offered robust coverage throughout the region, with 5G connectivity where supported. It even lets you tether other devices to your phone, so you can share the connection without relying on slow, unsecure public Wi-Fi (and if you've stayed in enough hotels, you'll know that can be a big problem).
Having reviewed all the best eSIMs for international travel , the 6 Japan eSIM providers below will give you exactly the connection you need with a range of features. We tested each service based on three main criteria: speed, coverage, and cost. But I've also looked at the unique features that make them a smart choice for visitors to the country.
Update: In this latest update, I've refreshed the entries for Saily and Airalo based on our new 2026 reviews, and added Nomad as a value plan for extended trips to Japan.
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Ubigi provides users with fast and reliable internet connectivity in over 200 destinations, with 90 having 5G available. Simply get a data plan that suits your needs for the country you're headed to —whether that's a quick 1-day plan, a flexible 7-day or 15-day option, or a more extended 30-day package. Then download the Ubigi app and be all set for your trip.
Use code TECHRADAR to redeem this offer .
Plans start from $4 for 1GB for 30 days
Unlimited plan for only $25 for 7 days
10% exclusive discount code- TECHRADAR
Plans start from $3.99 for 1GB for 7 days
Unlimited plans available to choose between 10-30 days
Plans start from $4 for 1GB for 3 days
Excellent coverage, with new unlimited data plans from $11.50
Plans start from $4 for 1GB for 4 days
Free access to WhatsApp chat, Uber, and Google maps when data runs out
Complimentary lounge access as an add-on
Plans start from $3.90 for unlimited data for 1 day
5% exclusive discount code- TECHRADAR
Plans start from $4 for 1GB for 7 days
The added bonus of a 50GB / 30-day plan that makes per-GB prices extra competitive.
Why you can trust TechRadar We spend hours testing every product or service we review, so you can be sure you're buying the best. Find out more about how we test.
Ubigi is a well-known eSIM provider offering services in most countries. It offers a range of data plans, including $4 for 1 GB for 30 days, $8 for 3 GB for 30 days, $17 for 10 GB for 30 days, and $55 for 50 GB for 30 days.
Ubigi also offers unlimited data plans for Japan. You can now get unlimited data for $25, valid for 7 days, or $66 for 30 days. We also like that they not only offer regional plans for Asia, which covers 26 countries (16 with the smaller Asia plan), but they have also bundled up countries from different regions. For example, for $21 you can get 10GB for Japan and the USA, which is valid for 30 days.
This eSIM veteran in the Japan market offers plans valid for up to a year, ideal for people who plan to stay in Japan for a long time. Ubigi works with Japanese mobile carrier NTT Docomo to provide robust coverage across Japan. This eSIM provider is owned by Transatel, a French subsidiary of the NTT Group, which in turn owns NTT Docomo, the largest telco network in Japan.
All Ubigi plans include a 5G connection if you’re in a Japanese region where that’s supported (the number of supported areas is rapidly increasing as time goes on). Buying and activating your eSIM is easy– you’ll pay online and scan the QR code sent to your email address to kickstart the process.
Use our code TECHRADAR to get 10% off your first order.
Saily is another reliable eSIM provider for visitors to Japan. Founded by Nord Security, it offers various plans, including $3.99 for 1 GB for 7 days, $7.99 for 3 GB for 30 days, $10.99 for 5 GB for 30 days, $18.99 for 10 GB for 30 days, and $26.99 for 20 GB for 30 days.
Saily offers a broad range of regional and global plans, partnering with local carriers for connection. So, alongside the standard Japan eSIM plan, the Asia and Oceania plan covers 22 countries, including Japan, with affordable pricing. Plans start from $4.99 for 1 GB for 7 days and go up to 100GB for 180 days, priced at $179.99.
On top of data-capped plans, Saily also offers unlimited data plans. For standalone Japan eSIMs, these prices start at $18.99 for 5 days, up to $71.99 for 30 days. On the Asia and Oceania plan, prices run from $21.99 up to $86.99.
We found using the app was really easy to use. Everything happens there, from activating the eSIM to monitoring usage and purchasing additional data. It's delightfully simple and user-friendly.
What really stood out to us was the robust security features at no extra cost, as you'd expect from a Nord-backed service. Here, you get an integrated ad blocker, web protection, and virtual location, letting you switch locations to browse from anywhere in the world. An independent study also found that Saily's ad blocker feature helps users save 30% of data , making this option more affordable.
We did run into a couple of issues, though: firstly, Saily's Japan plans are all data-only, with no talk-time or local number, so you'll need a fallback like WhatsApp or other VOIP providers to keep in touch. Secondly, coverage in remote areas of Southeast Asia was more unpredictable than we'd like, so if you're traveling beyond East Asia, we recommend checking which local carrier Saily uses in that destination.
Overall, Saily stands out for its affordability, simplicity, and security extras. The 24/7 customer support is also outstanding.
Airalo offers a range of eSIM plans for Japan, with prices starting from $4 for 1GB data over 3 days, up to $72 for 30-days unlimited data. It also operates a region-wide Asia eSIM covering 18 countries, with data-capped and unlimited data plans available.
Testing out this pre-paid service, Airalo proved to be an ideal pick for frequent travelers looking for predictable data costs. It's also incredibly easy to setup. Once you've bought the eSIM, point you phone camera at the QR Airalo sends, and follow the link to add it to your device.
Since the service links up with local carriers, coverage is among the most comprehensive of any eSIM provider we've tried. In most of the destinations where we tested it out, we got reliable speeds for all day-to-day tasks, like using a navigation app, messaging, and web browsing.
It's certainly not the cheapest eSIM for Japan, or anywhere else. In some cases, you'll save more money buying a local SIM card. But then, that's not the main attraction for Airalo. It's for those hopping between regions and countries, who want to connect wherever they are in the world. On that score, the service delivers.
Jetpac offers coverage in 150+ countries, including Japan. You can choose from various plans, including $4 for 1 GB for 4 days, $7 for 3 GB for 7 days, $10 for 5 GB for 30 days, $20 for 10 GB for 30 days, $29 for 15 GB for 30 days, $40 for 20 GB for 30 days, $60 for 30 GB for 30 days and $80 for 40 GB for 30 days.
Jetpac plans are cosliter than other providers on this list. For example, for 40GB of data for 30 days, it will cost you $80. However, with Airalo, you can get unlimited data for 30 days for $57.
Like its other counterparts in the market, Jetpac also offers regional Asian plans, but we like that they have separated these into Southeast Asia and Asia-Pacific plans.
The Southeast Asia plan covers 6 countries (Indonesia, Malaysia, the Philippines, Singapore, Thailand, and Vietnam). The Asia-Pacific plan covers 17 countries (Australia, Bangladesh, China, Hong Kong, India, Indonesia, Japan, Macau, Malaysia, New Zealand, Philippines, Singapore, South Korea, Sri Lanka, Taiwan, Thailand, and Vietnam). We recommend these plans if you are backpacking across Asia and will be traveling all around Asia.
I quite like that users can still access WhatsApp chat, Grab, Google Maps , and Uber even after data runs out. This feature ensures travelers can stay connected for essentials like navigation, communication, and transport.
One of the standout features of Jetpac is that they offer complimentary access to the Airport lounge. Register your flight on the Jetpac app and sign up your co-travelers. You will then receive a digital lounge key that can be used in case of a flight delay. You can sign up to 5 travel companions, ideal for a family.
Jetpac works with KDDI, Japan’s second-largest mobile carrier, to deliver robust internet service in this country. It offers a broad range of reasonably priced plans, although it lacks an unlimited plan.
The intuitive Jetpac mobile app allows you to buy and activate an eSIM, monitor and top up your data on the go, and more.
Holafly is an eSIM provider that offers unlimited data plans. In fact, Holafly has no capped data plans (it’s all unlimited) or fixed periods (you choose precisely how many days you want). Pricing depends on the number of days you choose, and Holafly is noticeably expensive.
For instance, one day costs $3.99, 10 days cost $36.90, 25 days cost $68.90, 50 days cost $96.90, and the maximum of 90 days costs $139.90.
Similarly, the Asia plan also has no cap on data, so you can simply choose the number of days. However, the Asia plan mostly covers countries in East and Southeast Asia, so make sure to check the list of countries before you purchase this plan.
Holafly has network-sharing agreements with KDDI and SoftBank Telecom, two major Japanese mobile carriers, to give customers excellent speed and coverage.
Holafly lets you share your data with your smartphone as a hotspot, but it’s capped at 500 MB daily. It doesn’t offer a phone number for calls and SMS, but VoIP apps like WhatsApp and Skype fulfill the same role over the internet.
For travellers who want access to fast 5G connections but also want control over their data use while in Japan, ByteSIM is an eSIM provider worth looking at.
Not only does the company offer a comprehensive combination of plans to allow you to set your daily data usage to your needs, it also has access to premium tier that offers data speeds of up to 871Mbps as well as unlimited data use, all through network partner KDDI.
There's also the option to use ByteSIM data access as a hotspot, which is handy if you want to connect things like laptops and tablets to the internet but don't want to wrangle with local Wi-Fi networks.
There are a couple of caveats in that if you're not on a premium plan then access to high-speed data only lasts as long as your data tier, with speeds being capped at 128kbps once you pass your limit. And these plans are data-only, so you won't get an assigned phone number through them.
But for the cellular data-hungry traveller to Japan, ByteSIM might be all you need. Plus installation is straightforward, with a QR code sent to your email and the plan auto-starting once you connect to a Japan-based network. Support is provided via a 24/7 WhatsApp and VoIP service.
Nomad offers various plans for travel to Japan, starting from $4 for 1GB for 7 days, up to $49 for unlimited data over 21 days. However, most plans are for 30 days, making it a compelling choice for extended visits to the region. Additionally, the provider has an Asia Pacific eSIM , covering up to 21 countries.
For our money, Nomad's eSIM for Japan offers exceptional value. It might not be the cheapest, but costs are still cheaper than most local carriers on roaming. And we especially liked the inclusion of the 50GB / 30 days data plan for $35. This option isn't available from a lot of eSIM providers, and drops costs to 70 cents per GB.
Unlike some eSIMs we've tested, features are lightweight here - the focus is chiefly on coverage. But there is one particular extra that we loved to see: tethering and hotspot is supported. If you're traveling with multiple devices, this is an essential feature that lets you share the phone's data connection instead of relying on public Wi-Fi. As we noted in our review, this "matters more than people realize until they're trying to get their laptop online from a hotel room in Tokyo."
Coverage is superb in East Asia, as well as Southeast Asia, Western Europe, and North America. Connections are generally fast, although it's worth noting that we found peak-hour slowdowns in dense urban areas like Tokyo can occur.
Overall, Nomad is a strong contender for anyone traveling to Asia multiple times or a year, or for extended visits, offering a good selection of well-priced plans.
eSIM means embedded SIM. As the name implies, it is a type of SIM embedded directly in a smartphone, instead of the typical SIM embedded in plastic and inserted in smartphones.
An eSIM comprises software installed on a chip embedded into the smartphone. You can’t physically remove the eSIM. Instead, you can reprogram it with new information to add or delete a network profile.
eSIMs are becoming more popular because of their convenience. They eliminate the need to swap SIM cards when switching to another network. Instead, everything works via software configurations, so you can add or remove network profiles without touching any physical components.
A single eSIM can hold up to eight network profiles, but you’ll hardly see a smartphone with eight physical SIM slots. Though less than a decade old, annual sales of eSIM-enabled devices are in the hundreds of millions and are projected to surpass 2 billion by 2025. With this trajectory, most devices could become eSIM-compatible within a few decades.
An eSIM makes it easy to retain internet access when visiting Japan. There’s no need to wait until you land in Japan for a physical SIM to last throughout your stay.
Instead, you can buy and activate an eSIM in your home country. When you get to Japan, simply turn on the eSIM profile to get data access.
The eSIM providers mentioned in this guide have agreements with Japanese telecom firms like NTT Docomo and SoftBank Telecom. When you buy an eSIM and visit Japan, you’ll tap into the same telecoms infrastructure that locals use.
Most new smartphones are eSIM-compatible. Some use both eSIMs and physical SIMs, while some have ditched the physical SIM slot and only work with eSIMs. With the current eSIM adoption trajectory, most smartphones could work only with eSIMs in a few decades.
You can check your device’s eSIM compatibility by following the steps below:
You can also check your smartphone manufacturer’s website for technical specifications. eSIM compatibility will likely be mentioned in your smartphone’s specifications document.
Cost is the first consideration when looking for an eSIM package. You should compare prices from different eSIM providers to get a fair deal.
However, cost shouldn’t be the only concern. You should weigh pricing against factors like validity, coverage, speed, and customer service.
Unlimited data plans are costlier than capped data plans. The higher the data allocation and validity period, the more you should expect to pay.
You need an eSIM provider with robust coverage across Japan. Fortunately, all eSIM providers on this list have reliable coverage, although you might be unable to access 5G outside urban centers. You'll enjoy the fastest connection possible in touristy regions like Tokyo and Osaka.
How long is your data plan valid for? Most eSIM providers limit their plans to 30 days, after which you must renew even if your data isn’t exhausted. However, a few, like Holafly, offer up to 90 days, and you can choose the exact number of days your data plan remains valid.
Your browsing habits determine the data plan you’ll choose from an eSIM provider. 5 GB to 20 GB is enough for the average foreign visitor. However, an unlimited plan is your best bet if you plan to download or stream lots of content. All the options listed offer unlimited data plans with fast speeds.
An ideal eSIM provider should offer excellent customer service. If things go wrong, you should be able to contact its support team via email, live chat, or telephone. It’s not just about having a support team; it’s about having skilled and experienced staff willing to resolve customers’ issues.
You can check user reviews of your desired eSIM provider to see if there are noticeable complaints regarding customer service.
We tested the best eSIMs for Japan by evaluating numerous factors. To start with, we looked at how easy the setup is, the simplicity of use on the go, and the connectivity and reliability of the service.
We carried out the tests using both iPhone and Android phone models in order to gauge whether the experience was the same for each, or whether one type had a greater advantage over the other. We then compared the overall results to draw up our list.
Udita Choudhary is a Content Sub Editor at TechRadar Pro where she manages several verticals including eSIM, programming and productivity. She also works on the affiliate side, managing the editorial needs of diverse clientele. She has written for publications such as Vogue Business, Marie Claire, and Homes & Gardens.
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