Best Unlimited Data eSIMs for Japan in 2026: Why I Use Sim Local
Looking for the best unlimited data eSIM for Japan in 2026? Then you probably already noticed that many eSIM providers advertise unlimited data, but in reality most of them come with a daily fair use policy, speed throttling or unclear terms and conditions.
After comparing the most popular Japan unlimited data eSIMs from Sim Local, Holafly, GigSky and other eSIM providers, Traveltomtom recommends the Sim Local AU eSIM for Japan because it offers truly unlimited high-speed data on the AU network, competitive prices and a much clearer deal than most other unlimited eSIMs for Japan.
Staying connected when traveling in Japan is essential. Whether you are navigating Tokyo by metro, using Google Maps in Kyoto, booking hotels, translating menus, ordering taxis, uploading content or staying in touch with family and friends, having a reliable Japan eSIM with unlimited data makes traveling so much easier.
Buying a prepaid SIM card for tourists in Japan can be time-consuming and not always straightforward, which is why an eSIM is by far the easiest way to get mobile internet in Japan. You can order your Japan eSIM online, install it before your trip and connect as soon as you arrive.
But what is the best unlimited data eSIM for Japan, and is Sim Local really better than Holafly, GigSky, Airalo and other Japan eSIM providers?
In this guide I compare the best unlimited data eSIMs for Japan, explain the difference between truly unlimited data and fair use policies, and show you why I personally use and recommend Sim Local for unlimited data in Japan.
Last update: July 2026.
This article contains affiliate links. If you purchase through these links, I may earn a small commission at no extra cost to you. All recommendations are based on independent research and personal experience.
Japan unlimited data eSIM Comparison
Don't just order an eSIM for Japan without comparing deals from other eSIM providers. Two other well-known providers that offer eSIMs for Japan with unlimited data are GigSky and Airalo.
Below is a comparison table of 7-days and 15-days unlimited data plans from Sim Local, Airalo, Holafly and GigSky, including the Fair Use Policy.
| Provider | 7-Days Plan | 15-Days Plan | Fair Use Policy |
|---|---|---|---|
| Sim Local | $19 USD | $39 USD | Truly unlimited high speed data |
| Airalo | $27 USD | $49 USD | Speed reduced after 3 GB per day |
| Holafly | ~$30 USD | ~$51 USD | Unclear T&C, FUP not disclosed |
| GigSky | ~$23 USD | ~$42 USD | Speed reduced after 2.5 GB per day |
Note: Holafly's fair use policy is not clearly defined, leading to potential trust issues due to unclear terms.
Furthermore, Holafly only allows 500 MB hotspot data per day, while the AU Sim Local eSIMs allow up to 1 GB data sharing per day.
The GigSky and Airalo unlimited data plans clearly state their Fair Use Policy (FUP), but both reduce data speed after a set amount of high-speed data per day.
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As an example: Airalo 7 days unlimited means in reality only 21 GB high speed data as their FUP is only 3 GB per day.
Based on price, data policy and hotspot allowance, Sim Local clearly offers the best unlimited data eSIM for Japan in this comparison.
Not everyone needs an unlimited data eSIM for Japan. If you only need a fixed data plan with 5 GB, 10 GB or 20 GB data, then check out my complete guide with the best eSIMs for Japan, including more budget-friendly eSIM deals for tourists.
Why is Sim Local the best unlimited data eSIM for Japan?
1. No FUP but truly unlimited data
The biggest reason why Traveltomtom recommends the Sim Local AU eSIM for Japan is simple: it comes with truly unlimited high-speed data.
Unlike most other unlimited eSIMs for Japan, there is no daily data cap after which your speed gets reduced. Many so-called unlimited eSIMs come with a fair use policy of 2 GB or 3 GB per day, but the AU eSIM from Sim Local does not have this limitation.
For example, unlimited data eSIMs from Airalo, Holafly, Nomad, GigSky and other providers often come with a FUP and throttle data speed after you reach your daily data cap.
That means you can use your phone in Japan without constantly checking your data usage. Perfect for Google Maps, public transport apps, social media, video calls, uploading content, streaming, booking hotels, finding restaurants and staying connected on the go.
2. Very competitive pricing
Compared to other eSIM providers the Sim Local eSIMs with unlimited data for Japan are unbeatable.
For example the best-buy Jetpac eSIM for Japan gives you 20 GB data $23 USD. Airalo charges you $26 USD for 20 GB data.
An AU eSIM from Sim Local with truly unlimited data for 7 days is only $19 USD!
3. Hotspot and tethering capabilities
Stay connected across multiple devices! Yes, the AU eSIM for Japan with unlimited data allows offering a hotspot for either your partner, kids or your laptop.
While data is unlimited, the fair usage policy allocates a specific amount for hotspot and tethering:
- 4 Days plan: up to 3 GB
- 7 Days plan: up to 6 GB
- 10 Days plan: up to 9 GB
- 15 Days plan: up to 15 GB
That means you get pretty much 1 GB data per day to use as a hotspot.
4. Reliability and speed
Sim Local collaborates directly with AU, one of Japan's major mobile internet providers. This gives travelers access to a reliable local network with high-speed connectivity across Japan.
On my latest trip to Japan I personally tested the Sim Local AU eSIM in Tokyo and Kyoto and the performance was excellent. The eSIM constantly connected to 5G and I regularly reached data speeds of more than 100 Mbps.
Whether you're navigating the Tokyo subway, using Google Maps in Kyoto, uploading travel content or staying connected on the go, having an eSIM connected to a strong Japanese mobile network makes a big difference.
5. Exclusive offer
The AU eSIMs available through Sim Local are specially designed for travelers, offering unique benefits not found elsewhere.
This exclusive partnership ensures a tailored experience for your journey, providing the peace of mind that comes with knowing you have reliable support and connectivity every step of the way.
Convinced? Then Click here to order your AU eSIM for Japan via Sim Local.
🎁 Exclusive Traveltomtom discount: Traveltomtom readers now also get an extra 15% discount when using the coupon code TRAVELTOMTOM at check out!
Sim Local unlimited data plans from AU
Let us straight away look at the available eSIMs from AU that you can order via Sim Local.
- Unlimited data for 4 days = $13 USD
- Unlimited data for 7 days = $19 USD
- Unlimited data for 10 days = $26 USD
- Unlimited data for 15 days = $39 USD
Click here to order your AU eSIM for Japan via Sim Local.
🎁 Exclusive Traveltomtom discount: Traveltomtom readers now also get an extra 15% discount when using the coupon code TRAVELTOMTOM at check out!
These plans provide truly unlimited data without speed caps!
No need to worry about speed throttling. The AU unlimited data eSIM for Japan ensures uninterrupted high speed connectivity throughout your journey in Japan.
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The importance of true unlimited data vs. FUP
One of the most significant advantages of choosing Sim Local's AU eSIM plans is the promise of real unlimited data. Unlike other providers that impose hidden speed caps or vague fair usage policies, Sim Local and AU deliver a reliable eSIM with truly uncapped high speed data.
This is particularly important for travelers who rely on constant connectivity, whether for navigating foreign cities, staying in touch with loved ones, or uploading travel content to social media.
Imagine being on a 10 hour bus ride in Japan and after 2 hours you hit the FUP and you are dealing with an eSIM with throttled data speed. Reduced data speed is always less than 1 Mbps which means you can barely use heavy data apps like Tiktok, Instagram and YouTube.
For travelers or digital nomads who need reliable internet without sudden slowdowns or cutoffs, the AU eSIMs with unlimited data from Sim Local are the perfect travel eSIM for Japan.
Final verdict on the best unlimited data eSIM for Japan
After comparing the most popular unlimited data eSIMs for Japan, Traveltomtom recommends the AU eSIM from Sim Local as the best choice for travelers who want truly unlimited high-speed data.
Sim Local is cheaper than most competitors, does not reduce your mobile data speed after a daily data cap and also allows hotspot and tethering within a clearly stated allowance.
At Traveltomtom we are convinced that Sim Local offers the best unlimited data eSIM for Japan in 2026, especially for travelers who use a lot of data for Google Maps, social media, video calls, content creation, streaming and staying connected on the go.
By choosing Sim Local, you're not just getting an eSIM, you're getting peace of mind, unbeatable value and the freedom to explore Japan without constantly worrying about your internet connection.
If you have any questions please leave me a comment below and I will help you out.