The best eSIM for Japan depends on how you travel. Airalo is a familiar all-round prepaid option, Saily currently offers the largest daily high-speed allowance among the daily-reset unlimited plans compared here, Ubigi is strong for larger fixed-data needs, and Holafly keeps things simple with day-based unlimited data. Eskimo is built around repeat-use flexibility, with non-expiring fixed data, transferable balance, hotspot support, and a reusable profile.
Quick answer: Airalo suits straightforward prepaid travel, Saily suits heavier daily use, Ubigi suits large fixed-data needs, Holafly suits simple unlimited trips, and Eskimo suits repeat travelers who care about unused data and reuse. For unlimited plans, compare the high-speed allowance rather than the word “unlimited” alone.
Japan eSIM Comparison Table
The “best for” labels below are editorial summaries based on the plan features shown in the table, not universal rankings.
| CATEGORY | AIRALO | SAILY | UBIGI | HOLAFLY | ESKIMO |
| Best for | Easy prepaid choice | Higher daily high-speed allowance | Large fixed plans | Simple unlimited trips | Repeat trips & flexibility |
| Fixed Plans | From 1 GB | 1-20 GB | Up to 50 GB | Not the main offer | 1-10 GB |
| Unlimited Plans | Yes | Yes | Yes | Yes | Yes |
| High-speed allowance | 3 GB/day | 5 GB/day | 60 GB/month* | FUP applies | 3 GB/day |
| After high-speed limit | 1 Mbps | Up to 1 Mbps | 2 Mbps | Carrier FUP | 1 Mbps |
| Hotspot | Yes | Yes | Yes | 1 GB/day | Yes |
| Unused fixed data | Expires with plan | Expires with plan | Expires with plan | Not applicable to unlimited trip plan | No expiry |
| eSIM reuse | Top-ups supported; device transfer not supported | Reusable; can reinstall on another device | Reusable across future plans | Trip eSIM stays on original phone | Reusable across future plans |
| Data transfer | No balance-transfer feature | No balance-transfer feature | No balance-transfer feature | No balance-transfer feature | Yes, paid fixed data |
| Japan networks | SoftBank + 1 other network | KDDI + SoftBank | KDDI + NTT Docomo | KDDI + SoftBank | SoftBank + KDDI |
| Reinstallation | Not transferable; same-device recovery may be possible for some plans | Supported, including another device with same account | Up to 5 reinstallations | Up to 4 total installs on same phone | Up to 5 reinstallations |
| Free trial | No standard Japan trial advertised | No standard Japan trial advertised | No standard Japan trial advertised | No standard Japan trial advertised | 250 MB Global trial |
*Ubigi’s current monthly unlimited Japan plan includes 60 GB at full speed before speeds are reduced to 2 Mbps for the remainder of the billing cycle.
Which Japan eSIM Is Best for Different Travelers?
Airalo: best for familiar prepaid plans
A practical choice if you want conventional fixed or unlimited packages from a widely used travel eSIM provider.
Saily: best for a higher daily high-speed allowance
Its current Japan unlimited plan provides 5 GB at unrestricted speed per day before data continues at up to 1 Mbps.
Ubigi: best for large fixed-data needs
Current Japan one-off plans include options up to 50 GB, while the profile can be reused for future plans.
Holafly: best for simple unlimited trips
Its Japan product is built around choosing the number of travel days rather than estimating a fixed GB allowance.
Eskimo: best for repeat trips and leftover data
Non-expiring fixed data, paid-data transfer, hotspot use, and a reusable profile make it particularly useful beyond one Japan trip.
Airalo: Best for Familiar Prepaid Plans
Airalo offers both fixed-data and unlimited Japan plans. Its current Japan page lists standard fixed-data packages from 1 GB as well as unlimited options for multiple trip lengths.
Airalo’s unlimited plans currently provide 3 GB of high-speed data per day. After that threshold, speeds are reduced to 1 Mbps until the next 24-hour reset. Unlimited plans support hotspot use, and tethered traffic follows the same daily Fair Use Policy.
Airalo currently lists SoftBank as the primary Japan network plus one additional supported network. Plans can be installed before departure and begin when the eSIM connects to a supported network.
Airalo’s eSIMs are tied to the device on which they are installed and cannot be transferred to another phone. Airalo’s help center notes that same-device recovery may be possible for some deleted eSIMs, but users should not assume a deleted profile can always be reinstalled.
Best suited to: Travelers who want a familiar prepaid setup with both fixed and unlimited choices.
Saily: Best for a Higher Daily High-Speed Allowance
Saily currently offers Japan fixed plans from 1 GB to 20 GB, plus unlimited plans. Its unlimited Japan product provides 5 GB per day without a speed restriction, followed by unlimited data at up to 1 Mbps.
Saily currently works with KDDI and SoftBank in Japan, supports hotspot sharing, and gives purchased plans a 180-day activation window.
The Saily eSIM can be reinstalled and used on a different compatible device as long as the traveler signs in with the same account email. New destination plans can also be added to the existing profile.
Best suited to: Travelers who prioritize a larger daily high-speed allowance before reduced speeds begin.
Ubigi: Best for Large Fixed-Data Plans
Ubigi offers one-off Japan plans including large fixed-data packages, with current listings reaching 50 GB. A current 10 GB / 30-day Japan plan is listed at US$16.50, while prices for other allowances vary by package.
Ubigi also offers a monthly unlimited Japan plan for US$45. It includes 60 GB at full speed before speeds are reduced to 2 Mbps for the rest of the billing cycle.
Ubigi currently uses KDDI and NTT Docomo in Japan, allows data sharing, and promotes its eSIM as reusable across 200+ destinations.
Its official support documentation allows the same Ubigi eSIM profile to be reinstalled up to five times after deletion, including on another compatible device once it has been removed from the previous one.
Best suited to: Longer stays, larger fixed-data needs, and travelers who value a reusable profile.
Get Eskimo eSIM to stay connected in Japan
Need internet in Japan? Here's what we recommend:
Fixed data plans
- No speed reduction
- No expiry, keep your data forever
- Transfer data to anyone
- Personal hotspot
Unlimited data plans
- Unlimited day pass
- Daily 3GB high-speed + 1Mbps unlimited after
- Personal hotspot
Holafly: Best for Simple Unlimited Trips
Holafly’s Japan product centers on unlimited data selected by trip duration. Its current Japan page lists KDDI and SoftBank and allows travelers to choose the number of days they need.
The plan remains subject to Fair Use Policies, so unlimited does not guarantee unrestricted maximum speed at all times. Holafly currently allows 1 GB of hotspot sharing per day on the Japan destination plan.
Holafly also includes its Always On benefit with current eSIMs. This provides 1 GB of backup data every 30 days in supported destinations while the eSIM remains installed. The allowance does not roll over, cannot be used for hotspot sharing, and is separate from the purchased Japan travel-plan allowance.
Holafly’s current support documentation says a trip eSIM can be installed up to four times in total on the exact same phone. It cannot be transferred to a different phone.
Best suited to: Travelers who want a simple day-based unlimited plan and do not want to estimate total GB usage in advance.
Eskimo: Best for Repeat Trips and Flexible Data Use
Eskimo’s Japan eSIM currently uses SoftBank and KDDI and offers both fixed and unlimited data.
Current fixed plans do not expire, so unused paid data can remain available instead of disappearing at the end of a short validity period. Fixed plans also support personal hotspot.
Paid fixed data can be transferred to another Eskimo user. Eskimo’s current data-transfer guide states a minimum transfer amount of 500 MB. Unlimited-plan data cannot be transferred.
Eskimo’s unlimited option currently provides 3 GB of high-speed data per day, followed by unlimited data at 1 Mbps until the daily reset.
Eskimo’s device-transfer guides state that the eSIM can be reinstalled up to five times. New users can currently claim a 250 MB Global eSIM trial with no expiry. Travelers continuing beyond Japan can also compare the Japan-only plan with Eskimo’s Asia Pacific eSIM or Global eSIM.
Best suited to: Repeat travelers, groups, and anyone who wants leftover fixed data to remain useful after the Japan trip ends.
What Does “Unlimited Data” Really Mean?
Unlimited travel eSIMs can still limit the amount of data delivered at maximum speed through a Fair Use Policy.
Airalo currently provides 3 GB of high-speed data per day before 1 Mbps applies. Saily provides 5 GB per day before data continues at up to 1 Mbps. Eskimo provides 3 GB per day before 1 Mbps applies. Ubigi uses a different monthly structure with 60 GB at full speed before 2 Mbps. Holafly does not publish one simple Japan high-speed threshold on its destination page and instead applies carrier Fair Use Policies.
If you mostly use maps, messaging, translation, email, and ordinary browsing, a fixed plan may be enough. If you stream video, upload large files, work remotely, or tether a laptop, the high-speed allowance matters much more.
Japan eSIM Coverage: SoftBank, KDDI, and NTT Docomo
The providers compared here currently use combinations of Japan’s major networks, including SoftBank, KDDI, and NTT Docomo.
For most trips through Tokyo, Kyoto, Osaka, Nagoya, Fukuoka, and other large cities, all three major networks can provide strong coverage. Rural areas, mountain routes, islands, tunnels, and busy transport corridors can vary more.
A provider listing more than one network can offer additional roaming options, but it does not guarantee that the phone will always select whichever carrier is strongest at a particular location.
If you want a deeper explanation of plan types, activation, and what to check before buying, see the guide on how to choose an eSIM for Japan. This article focuses specifically on comparing providers.
Fixed or Unlimited: Which Is Better for Japan?
Choose fixed data if your usage is predictable and you mainly need navigation, messaging, browsing, social media, and occasional video. It is easier to know how much full-speed data you are buying.
Choose unlimited if you expect heavier use or do not want to monitor a fixed GB balance. The important comparison is the high-speed allowance and what happens after that allowance is used.
Unused-data rules also matter. A low upfront price can become poor value if a large unused balance expires. For frequent travelers, a reusable profile or non-expiring balance can matter more than the lowest initial price.
How to Prepare Your Japan eSIM Before Departure
Whichever provider you choose, check that your phone is network-unlocked and supports eSIM before purchase. Installing the eSIM while you still have reliable Wi-Fi can make arrival easier, but follow the provider’s activation instructions so the plan does not start earlier than intended.
If you are new to eSIM setup, use Eskimo’s eSIM installation guide for a step-by-step explanation of the typical installation process. Exact screens and activation steps can differ by phone and provider.
Final Verdict
There is no single Japan eSIM that is best for every traveler. Airalo is a practical all-round prepaid option. Saily currently has the largest daily high-speed allowance among the daily-reset unlimited plans compared here. Ubigi is particularly useful for larger fixed-data needs and reusable-profile travel. Holafly is simple if you want unlimited data based mainly on trip duration.
Eskimo is strongest when flexibility beyond a single trip matters. Non-expiring fixed data, transferable paid balance, hotspot support, and a reusable profile make it particularly relevant for repeat visitors or travelers who do not want unused paid data to disappear.
FAQs
Which eSIM has the best coverage in Japan?
There is no defensible single coverage winner for every location. The providers compared here use combinations of SoftBank, KDDI, and NTT Docomo, while actual performance depends on location, congestion, device compatibility, and roaming arrangements.
Which Japan eSIM is best for a short trip?
For a short stay, compare the live price for the exact number of days and amount of data you expect to use. Light users may save with fixed data, while heavier users may prefer unlimited plans.
Which Japan eSIM is best for heavy daily use?
Among the daily-reset unlimited plans compared here, Saily currently provides the largest unrestricted-speed allowance at 5 GB/day. Ubigi uses a different monthly model with 60 GB at full speed before 2 Mbps applies.
Which Japan eSIM is best for repeat trips?
Eskimo is especially useful for repeat travel because its current fixed data does not expire. Saily and Ubigi also support reusable eSIM profiles.
Can I buy a Japan eSIM before traveling?
Yes. All five providers allow purchase before arrival. Activation timing differs, so follow the exact instructions for the plan you choose.
Can I use hotspot with a Japan eSIM?
Airalo, Saily, Ubigi, and Eskimo support hotspot use on the relevant plans reviewed here. Holafly currently allows 1 GB/day of hotspot sharing on its Japan destination plan.
Is unlimited Japan eSIM data truly unlimited?
Total data may be unlimited, but maximum-speed data is commonly governed by a Fair Use Policy. Compare the high-speed allowance and reduced-speed rule, not just the word “unlimited.”
Does Eskimo Japan data expire?
Current Eskimo fixed plans do not expire, so unused fixed data can remain available for future compatible use.
Can I share Eskimo data with another traveler?
Yes. Personal hotspot is supported, and paid fixed data can also be transferred to another Eskimo user. Eskimo’s current transfer guide states a 500 MB minimum transfer amount.
Should I choose Japan-only, Asia Pacific, or global coverage?
Choose a Japan-only plan if Japan is your only destination. If you are traveling through several Asian countries, compare the Asia Pacific eSIM. For broader multi-region travel, consider the Global eSIM.
