Planning to visit the Land of the Rising Sun? Don’t forget the best eSIM for Japan to avoid roaming charges and stay connected. Pretty much all eSIM providers offer plans for Japan, but finding the best ones can be daunting. We took it upon ourselves and retested dozens across multiple Japanese cities in 2026.
After a lengthy analysis, we settled on the five best eSIMs for Japan. We didn’t pick them randomly. Unlimited data, nationwide coverage, ease of use and value for money were our driving forces. One of them also happens to belong to the group that runs Japan’s largest mobile network, which turns out to matter a great deal.
Best eSIM for Japan Ranked
Best eSIM for Japan: Prices, Networks and Data Compared
The five side by side, with promo codes applied:
| eSIM | Best for | Starting price | Unlimited data | Network | Promo code |
|---|---|---|---|---|---|
| Ubigi | Best overall | $3.50 / 1 GB / 3 days | $39 / 15 days, $66 / 30 days | Japan’s top two networks (NTT group) | GIZMODO (-10% first order) |
| Saily | Security and travel perks | $3.39 / 1 GB / 7 days | $41.64 / 15 days, $61.19 / 30 days | 4G/5G | GIZMODO (-15% all plans) |
| Holafly | Uncapped unlimited data | $3.90 / day | Every plan (from $3.90) | Softbank + KDDI | N/A |
| Airalo | Flexible plans | $4 / 1 GB / 3 days | From $10.50 / 3 days, $66 / 30 days | 4G only | N/A |
| Jetpac | Cheapest entry at $1 | $1 / 1 GB / 4 days | $65.99 / 30 days | 4G/5G | N/A |
Best eSIM for Japan in 2026: Detailed Comparison
We compared all five on price, data allowances, network access, tethering and plan length, and used each one extensively on the ground. Here’s what we found.
1. Ubigi
Pros
- Part of the NTT group, on Japan’s top two networks
- Cheap eSIM plans for Japan
- Unlimited data and unlimited tethering
- Great 5G coverage
Con
- No phone number
Start with the thing nobody else can claim. Ubigi is a brand of Transatel, and Transatel belongs to NTT, the group that operates Japan’s largest mobile network. Every other provider on this page is a foreign reseller buying access. Ubigi is inside the family, and it runs on Japan’s top two networks with 5G on both. In this particular country, that’s not a marketing line, it’s the whole argument.
The pricing backs it up. Ubigi starts at only $3.50 for a gigabyte over a short, 3-day trip, with weekly, monthly, annual and one-off plans available. The 25 GB plan for 30 days at $32 is the best seller, but plenty of people take unlimited data for 15 days at $39, or a full month at $66, one of the lowest prices anywhere. There’s also 10 GB for 7 days at $14.
So how does it perform? We tested in Tokyo and Osaka and 5G coverage was exemplary, with top-tier speeds for everything. We streamed Netflix and gamed without lag, and shared our data without limits.
Ubigi is easy to install and activate: scan the QR code, follow the steps, done. And if you run out of data with no Wi-Fi around, Ubigi sponsors the connection for as long as it takes you to top up, so you’re never stranded. More detail in our Ubigi 2026 review.
The only downside is the lack of a Japanese phone number. Having spent a lot of time there, we can tell you the Japanese themselves lean heavily on mobile data for calls and messaging, so it rarely bites. Avoid roaming altogether with 10% off your first purchase using GIZMODO.
2. Saily
Pros
- Cheapest entry plan at $3.39
- Security extras on every plan
- Airport lounge access in the app
- 30-day activation period
Cons
- Unlimited plans throttle after 5 GB a day
- No phone number
Saily lets you remain anonymous online thanks to its security features: an ad blocker and a virtual location on every plan. The Ultra plan adds NordVPN and NordPass, and works in 120+ locations, Japan included. The entry plan costs $3.99, or $3.39 with the GIZMODO code, which makes it the cheapest way onto a Japanese network.
Saily’s best-seller is the 20 GB plan for a month at $24.99, or $21.24 with the code. Unlimited data is $48.99 for 15 days ($41.64 discounted) and $71.99 for a month ($61.19 discounted). Worth knowing before you buy: the unlimited plan gives you 5 GB per day at full speed, then keeps you connected at 1 Mbps. Fine for maps and messaging, less so for streaming.
Saily isn’t quite as fast as Ubigi, but its 5G and 4G coverage holds up, and the occasional speed drop never ruined a session.
New in 2026: the app now sells airport lounge access and fast-track security passes at checkout, with no subscription needed. On a long connection at Haneda or Narita, that’s worth more than another gigabyte. Saily was named “Rising Star” at the MVNOs World Congress in Amsterdam in June 2026.
We love the easy app, the one-click activation, and the 30-day activation period, which lets you buy at home and switch on when you land. Tethering is standard, 24/7 chat support is built in, and Saily’s Asian regional plans cover nearly every major country nearby if you’re continuing on. Current deals are on our Saily promo code page.
Save 15% off with code GIZMODO! Through Gizmodo, you can save 15% on all Saily plans by using the promo code GIZMODO at checkout.
3. Holafly
Pros
- Unlimited data with no throttling
- Softbank and KDDI networks
- 24/7 customer service
- Intuitive eSIM app
Cons
- Limited tethering (500 MB/day)
- Expensive over a month
The best eSIM for Japan for limitless data starts at $3.90 per day, and the rate falls the longer you stay: $27.30 for seven days, $74.90 for thirty. Holafly charges zero roaming fees and is one of the fastest eSIMs for Japan.
Its edge in 2026 is that the data is genuinely uncapped. No 5 GB daily allowance, no drop to 1 Mbps. Saily throttles, Holafly doesn’t, and if you stream on the move that single difference is what you’re paying for.
Superb 4G and 5G coverage follows you everywhere, since Holafly runs on Softbank and KDDI. Gaming, streaming, chatting and browsing are buttery-smooth. You can share data, but only up to 500 MB per day, which effectively means one plan per person.
Holafly compensates with 24/7 support that answers instantly. Activation is immediate, and we had coverage everywhere we went. It also lets you keep your number on WhatsApp and other VoIP apps, so staying in touch is easy. The one thing to weigh is the price: $74.90 for a month against Ubigi’s $66.
4. Airalo
Pros
- Very affordable
- Unlimited data sharing
- Data consumption tracking
Cons
- Limited to 4G in Japan
- No Japanese phone numbers
Airalo is a flexible eSIM for Japan with one glaring weakness: a 4G LTE ceiling. You can’t switch to 5G, though that hurts less than it sounds, because Japanese LTE is fast and reliable when it’s done properly, and here it is. Setup is seamless and plans start at $4 for 1 GB over three days.
Plans run up to 30 days and stay affordable. 20 GB costs $22.50, for instance. Switch to unlimited data and three days cost $10.50, while a full month is $66, matching Ubigi. Airalo isn’t as fast, but it offers unlimited data sharing and apps for iOS and Android with consumption tracking built in.
You won’t need that tracker if you go unlimited. Airalo has 24/7 live chat and the best Asian coverage of the five in its regional Asia plan. Heading on to Hong Kong or Thailand? You’ll get the same treatment. If your route runs west instead, we’ve also ranked the best eSIM for Tunisia.
5. Jetpac
Pros
- The cheapest Japan eSIM at $1
- Subscriptions for frequent travelers
- Free data for WhatsApp & Uber
Cons
- Slower than the top three
- No phone calls or SMS
Easily the best eSIM for Japan for a dollar in 2026. If you have more to spend, the 30 GB plan at $29.99 for 30 days is the one we’d take for a longer stay. Want limitless data instead? That’s $65.99 for 30 days, which sits right alongside Ubigi and Airalo. Jetpac also runs two subscriptions: JetFlex and JetPro.
Both are travel packages with worldwide coverage and data for people who are constantly abroad. Regional plans exist too, and the Asian variants deliver solid 4G and 5G. Jetpac’s standout feature remains free data for WhatsApp, Uber, Grab and Google Maps, which keeps you navigating even after your allowance is gone.
You can buy lounge access for cancelled or delayed flights, or get it free with JetPro. Saily now sells lounge passes too, though only Jetpac triggers them automatically on a delay. Jetpac’s real limitation is speed: it’s reliable, but a step behind the top three.
Factors to Consider When Choosing an eSIM for Japan
The best eSIM provider for you may not be the best for us. So when picking an eSIM for Japan, weigh these:
- Data allowance. The provider should offer both metered and unlimited plans, so you can match your daily consumption rather than overpay.
- Fair use policies. Unlimited rarely means unlimited. Saily gives 5 GB a day at full speed and then throttles to 1 Mbps. Holafly never throttles at all.
- Duration of your trip. Three days in Japan? Don’t buy a 30-day plan.
- Network access. Ubigi reaches Japan’s top two networks thanks to NTT, Holafly runs on Softbank and KDDI, and Airalo is 4G only. That’s the ranking that matters outside the big cities.
- Data tethering. Travelling with friends? Ubigi, Saily, Airalo and Jetpac all share without limits. Holafly caps you at 500 MB a day.
- Price. All five cost less than roaming, so pick the one that fits your budget.
The Final Verdict
Whenever you venture abroad, you need an eSIM. Whether it’s the best eSIM for Japan or anywhere else, it’s the only reliable way to stay online while slashing roaming fees to zero. Ubigi tops our list, and in Japan the reason is structural: it belongs to the NTT group, it runs on the country’s top two networks with 5G on both, and its unlimited month at $66 is among the cheapest.
Saily is the pick for security, and cheaper than it looks once the code applies: $3.39 to get started, $21.24 for 20 GB over a month. Holafly is the only one whose unlimited data never slows down. Airalo is flexible, if 4G-bound. And Jetpac is the budget play, with free data for the apps you’ll actually use.
Get your eSIM before you fly, so it activates the moment the plane lands.
Frequently Asked Questions
How to set up an eSIM in Japan?
It begins by confirming your phone is supported, which you can do on the chosen eSIM provider's site. After that, download the app and follow the steps. Most providers are set up from the app, while others send a QR code that you scan and perform the required steps. Either way, it's always straightforward.
Do I really need an eSIM when traveling to Japan?
Yes, you really need one if you want to stay connected and avoid roaming fees. Roaming is very expensive in Japan, and purchasing a local SIM card isn't an option for many, mostly due to the language barrier and the need to swap out their old SIM card. With an eSIM, you don't need to touch your original physical SIM.
What's the cheapest eSIM for Japan?
Based on our analysis, Jetpac is the cheapest option, starting at $1 for 1 GB of data for four days. Ubigi follows, with a price of $3.50 for the same data amount for three days. All five are generally inexpensive and a great option for budget users in Japan. In fact, they're also great eSIMs for Asian countries in [year].