Cheapest eSIM for Japan
The cheapest eSIM for Japan right now is SimSmash, 50 GB for 30 Days at $19.99. That is $0.40 per GB.
1835 plans from 61 providers, watched and re-ranked by the real price per gigabyte. Every one is a prepaid travel eSIM for Japan that you buy online and install before you fly, so it works the moment you land.
Swipe the table for price and verdict →
| Rank | Provider | Data | Validity | Price (USD) | Price per GB | Verdict | Get |
|---|---|---|---|---|---|---|---|
| Paid placement. It sits above the ranking and does not change it. Advertise here | SponsoredPaid placement. It sits above the ranking and does not change it. Advertise hereMegaEsim Coupon: ESIMWATCHDOG |
50 GB | 30 Days | $23.80 | $0.48 | Sponsored | Get |
| 1 | SimSmash | 50 GB | 30 Days | $19.99 | $0.40 | Best value | Get |
| 2 | Yatelo Coupon: ESIMWATCHDOG |
50 GB | 30 Days | $22.15 | $0.44 | Great | Get |
| 3 | SparkRoam Coupon: ESIMWATCHDOG5 |
50 GB | 30 Days | $22.70 | $0.45 | Great | Get |
| 4 | Travel eSIM | 50 GB | 30 Days | $22.76 | $0.46 | Great | Get |
| 5 | AdventureSIMs Charged in AUD Coupon: WATCHDOG |
50 GB | 30 Days | $23.49 | $0.47 | Great | Get |
| 6 | MegaEsim Coupon: SUMMER10 |
50 GB | 30 Days | $23.80 | $0.48 | Great | Get |
| 7 | CloudOn | 50 GB | 31 Days | $23.99 | $0.48 | Great | Get |
| 8 | AirPlans Coupon: ESIMWATCHDOG |
50 GB | 30 Days | $24.43 | $0.49 | Great | Get |
| 9 | AlpineSIM | 50 GB | 30 Days | $24.44 | $0.49 | Great | Get |
| 10 | SimSmash | 20 GB | 30 Days | $9.99 | $0.50 | Great | Get |
| 11 | Connect Me Guru Coupon: hello-saun |
50 GB | 30 Days | $25.90 | $0.52 | Good | Get |
| 12 | Wanderly Coupon: ESIMWATCHDOGWILDCARD |
50 GB | 30 Days | $25.99 | $0.52 | Good | Get |
| 13 | eSIM Hero | 50 GB | 30 Days | $26.00 | $0.52 | Good | Get |
| 14 | Tourist eSIM | 50 GB | 30 Days | $26.50 | $0.53 | Good | Get |
| 15 | Lempart Flex Coupon: ESIMWATCHDOG |
50 GB | 30 Days | $27.49 | $0.55 | Good | Get |
| 16 | SparkRoam Coupon: ESIMWATCHDOG5 |
20 GB | 30 Days | $11.26 | $0.56 | Good | Get |
| 17 | AirPlans Coupon: ESIMWATCHDOG |
20 GB | 30 Days | $11.29 | $0.56 | Good | Get |
| 18 | eSIMfly | 50 GB | 30 Days | $28.05 | $0.56 | Good | Get |
| 19 | Horizon eSIM | 50 GB | 30 Days | $28.91 | $0.58 | Good | Get |
| 20 | Lempart Flex Coupon: ESIMWATCHDOG |
50 GB | 90 Days | $28.99 | $0.58 | Good | Get |
| 21 | ASIMGO Coupon: ESIMWATCHDOG10 |
50 GB | 20 Days | $29.24 | $0.58 | Good | Get |
| 22 | AlpineSIM | 20 GB | 30 Days | $11.79 | $0.59 | Good | Get |
| 23 | CocoRoam | 10 GB | 5 Days | $6.00 | $0.60 | Good | Get |
| 24 | eSIMCard Coupon: eSbljricbt |
20 GB | 7 Days | $11.93 | $0.60 | Good | Get |
| 25 | Wanderly Coupon: ESIMWATCHDOGWILDCARD |
20 GB | 7 Days | $11.99 | $0.60 | Good | Get |
| 26 | ASIMGO Coupon: ESIMWATCHDOG10 |
30 GB | 30 Days | $17.94 | $0.60 | Good | Get |
| 27 | MobiMatter Coupon: ESIMWATCHDOG |
50 GB | 30 Days | $29.99 | $0.60 | Good | Get |
| 28 | eSIMCard Coupon: eSbljricbt |
5 GB | 3 Days | $3.03 | $0.61 | Good | Get |
| 29 | CocoRoam | 10 GB | 3 Days | $5.50 | $0.61 | Good | Get |
| 30 | Earth Esim Coupon: ESIMWD5 |
50 GB | 90 Days | $30.74 | $0.61 | Good | Get |
| 31 | Travel eSIM | 20 GB | 30 Days | $12.33 | $0.62 | Good | Get |
| 32 | HiRoaming Coupon: ESIMWATCHDOG20FIRST |
50 GB | 30 Days | $30.84 | $0.62 | Good | Get |
| 33 | Yatelo Coupon: ESIMWATCHDOG |
20 GB | 30 Days | $12.57 | $0.63 | Okay | Get |
| 34 | Connect Me Guru Coupon: hello-saun |
20 GB | 30 Days | $12.70 | $0.64 | Okay | Get |
| 35 | Tourist eSIM | 20 GB | 30 Days | $12.70 | $0.64 | Okay | Get |
| 36 | eSIM Hero | 20 GB | 30 Days | $13.00 | $0.65 | Okay | Get |
| 37 | MyTravel eSIM | 50 GB | 30 Days | $32.50 | $0.65 | Okay | Get |
| 38 | MegaEsim Coupon: SUMMER10 |
10 GB | 30 Days | $6.58 | $0.66 | Okay | Get |
| 39 | Horizon eSIM | 10 GB | 7 Days | $6.62 | $0.66 | Okay | Get |
| 40 | Mobal | 50 GB | 16 Days | $32.70 | $0.68 | Okay | Get |
| 41 | Skyalo Coupon: ESIMWATCHDOG |
50 GB | 30 Days | $33.99 | $0.68 | Okay | Get |
| 42 | Lumbus Coupon: ESIMWATCHDOG10 |
50 GB | 30 Days | $33.99 | $0.68 | Okay | Get |
| 43 | Cellesim Coupon: ESIMWATCHDOG |
50 GB | 30 Days | $34.00 | $0.68 | Okay | Get |
| 44 | AdventureSIMs Charged in AUD Coupon: WATCHDOG |
20 GB | 30 Days | $13.81 | $0.69 | Okay | Get |
| 45 | MobiMatter Coupon: ESIMWATCHDOG |
20 GB | 30 Days | $13.99 | $0.70 | Okay | Get |
| 46 | Nomad | 50 GB | 30 Days | $35.00 | $0.70 | Okay | Get |
| 47 | eSIM4Travel | 29.3 GB | 30 Days | $20.75 | $0.71 | Okay | Get |
| 48 | Soovia | 50 GB | 30 Days | $35.70 | $0.71 | Okay | Get |
| 49 | eSIMfly | 20 GB | 30 Days | $14.43 | $0.72 | Okay | Get |
| 50 | eSIM4Travel | 19.5 GB | 30 Days | $14.28 | $0.73 | Okay | Get |
| 51 | Superalink Coupon: ESIMWATCHDOG |
1 GB | 1 Day | $0.75 | $0.75 | Okay | Get |
| 52 | Superalink Coupon: ESIMWATCHDOG |
5 GB | 2 Days | $3.74 | $0.75 | Okay | Get |
| 53 | Textr | 20 GB | 30 Days | $14.96 | $0.75 | Okay | Get |
| 54 | esim0 Coupon: WATCHDOG |
50 GB | 30 Days | $37.99 | $0.76 | Okay | Get |
| 55 | Simbye Coupon: DOG |
50 GB | 180 Days | $38.24 | $0.76 | Okay | Get |
| 56 | Earth Esim Coupon: ESIMWD5 |
30 GB | 90 Days | $23.24 | $0.77 | Okay | Get |
| 57 | Roamix Coupon: ESIMWATCHDOG |
50 GB | 30 Days | $38.90 | $0.78 | Okay | Get |
| 58 | SwipSIM | 50 GB | 30 Days | $39.19 | $0.78 | Okay | Get |
| 59 | Lumbus Coupon: ESIMWATCHDOG10 |
20 GB | 30 Days | $15.99 | $0.80 | Fair | Get |
| 60 | ByteSIM | 30 GB | 10 Days | $24.90 | $0.83 | Fair | Get |
1038 of these 1835 plans were checked against the seller's own shop on 16 October 2026. The rest come from the seller's own feed or plan pages and are not yet independently checked.
The Watchdog Pick is chosen automatically: the lowest real price per GB of the 1835 plans in this view. Bulk data pools above 50 GB cannot win it, because their per GB rate only exists if you use data no traveller uses. Providers cannot pay for it, and a commission never changes the ranking. Prices are shown in USD and can change at checkout.
Price per GB counts only data you can use inside the validity, at most 3 GB a day, so a big pool on a short validity cannot buy the top spot. Every provider's best two plans come first, then the rest. A plan marked Unverified price undercuts every other provider here by more than half and waits at the end until we have checked it on the seller's site. How we rank
Unlimited rows show the daily amount at full speed. Some rows also show the speed after that amount. A row with no speed does not mean the plan stays fast, so check the plan on the seller's site.
Some links here earn us a commission. It never changes the order. How we make money The row marked Sponsored is a paid placement shown above the ranking, not part of it. Advertise here.
Crossing borders on this trip? Compare multi country Asia eSIM plans that keep one line working across several destinations.
Cheapest eSIM for Japan: the numbers
As of 16 October 2026, 06:08 GMT, the cheapest eSIM for Japan is SimSmash with 50 GB for 30 Days at $19.99. That is $0.40 per GB, the best rate of the 1835 plans we compare from 61 providers. 1166 plans include 5G. 562 support top ups. That timestamp is the exact moment of our latest price check, and the table above always shows the live order.
Which is the best eSIM for Japan?
There is no single best eSIM for Japan, because the right plan depends on how long you stay and how much data you use. What we can do is rank the 1835 plans on the numbers, as they stand on 16 October 2026:
- Best value overall SimSmash, 50 GB for 30 Days at $19.99. That is $0.40 per GB, the lowest real rate of every Japan plan we track.
- Best for a short trip Superalink, 1 GB for 1 Day at $0.75. The cheapest ticket that still gives you at least 1 GB for a week or less.
- Highest daily cap on an unlimited plan ByteSIM, 30 Days at $89.90, full speed up to 10 GB a day. Set that daily cap against the fixed plan above before you pay for the word unlimited.
None of these picks is chosen by a person. Each one is the first row of a sort on live prices, so it changes whenever a provider moves a price, and SimSmash did not pay to be named here.
Which mobile networks does Japan have?
Japan reached 98.4 percent 5G population coverage by the end of fiscal year 2024, and 4G availability on the two biggest networks sits around 99.6 percent.
- NTT Docomo: Docomo is the biggest network with about 92 million subscribers and wins Opensignal's coverage awards for the widest footprint in populated areas, including rural Japan.
- au (KDDI): au is the second largest carrier with about 71 million contracts and matches Docomo in a statistical tie for network availability at around 99.6 percent.
- SoftBank: SoftBank has about 56 million subscribers including its Y!mobile subbrand and posted the fastest overall median download speed in Japan at 62 Mbps in Q3 2025.
- Rakuten Mobile: Rakuten is the newest entrant with about 9 million subscribers, cheap plans, and the fastest median 5G download speed at around 128 Mbps, though its own coverage is thinner outside cities.
Travel focused MVNOs like Mobal and Sakura Mobile matter here because mainstream voice plans need a residence card, so they are the practical route to a Japanese number for visitors.
The eSIM plans we compare on this page connect to:
The list above is Japan's operator market. The badges are the networks our tracked plans actually roam onto, which can be a subset of it, and the same network is sometimes sold to roaming partners under a different brand name. So a guide praising an operator you do not see badged here is describing a local SIM, not the travel eSIMs compared above.
Is 5G available in Japan?
All four carriers run 5G nationwide. Docomo has the widest 5G coverage while Rakuten posts the fastest 5G speeds, and 5G works in all cities and along main rail corridors.
How much data do you need in Japan?
Light use is about 500 MB a day. That covers maps, messages, and some browsing. Normal use with photos, social apps, and short videos runs 1 to 1.5 GB a day. Streaming and hotspot use can eat 2 to 3 GB a day. Here is what each size costs in Japan right now:
Are unlimited eSIMs for Japan really unlimited?
Not always. 708 of the 1835 plans above are sold as unlimited, and most of them carry a daily fair use cap. A further 41 plans are unlimited in a different way: one capped speed for the whole plan, shown next to the word Unlimited in the table. For Japan the caps we can see published are 0.5 to 10 GB a day: past that the speed drops, often to 1 Mbps or less, until the clock resets. That is fine for messages and maps, slow for video. At $0.40 per GB from SimSmash, a fixed plan often works out cheaper than unlimited unless you genuinely burn several GB a day. That is why we rank by price per GB and not by the word on the label.
Here is what each seller on this page actually allows per day before it slows you down. No seller publishes this next to its rivals, which is exactly why it is worth showing.
Every seller that publishes a daily allowance is listed on our daily data caps page, with the cheapest plan at each one. The gap between the top and bottom of that table is the whole point. Two plans both sold as unlimited can differ several times over in what you actually get at full speed, and the cheaper one is not always the smaller allowance.
eSIM or a local SIM card at the airport in Japan?
An eSIM is ready before you land. No queue, no shop, no handing over your passport at a counter for a tourist SIM card. Data for Japan starts at $0.28 on this page, which is hard for airport kiosks to beat. A local SIM still makes sense if you need a local phone number or plan to stay for months. For a normal trip, the eSIM wins on price and effort.
Setting up your Japan eSIM
Pick the plan, not the brandThe cheapest rate in Japan today is $0.40 per GB from SimSmash, against a median of $1.47. The QR code arrives by email within minutes of paying.
Install before you flyScan the QR code on wifi at home. Installation needs a connection, and the one thing you will not have when you land in Japan is a working connection.
Turn it on when you landEnable the eSIM and turn on data roaming for it, then give it a minute to attach to KDDI, KDDI/au, NTT docomo, Rakuten Mobile, SoftBank, Softbank, kddi. Expect 5G where the network reaches, 4G everywhere else.
Know what happens when it runs out562 of the 1835 plans here can be topped up, so running out is not the end of the trip. If you would rather over buy than top up, the cheapest plan with at least 5 GB is eSIMCard at $3.03.
Good to know before you land in Japan
Voice SIMs are effectively limited to residents with a residence card; tourists get data only SIMs or the few tourist voice options like Mobal and SoftBank airport counters. From April 2026 Japan requires passport or residence card ID for every SIM and eSIM purchase, including data only plans.
Narita and Haneda have SIM counters and 24 hour vending machines in arrivals, with prepaid data SIMs from roughly 2,000 to 3,000 yen for small allowances up to about 10,000 yen for long unlimited plans. A passport is required at purchase.
If you want the best rural and mountain coverage, pick a SIM or eSIM that runs on the Docomo network, which has the strongest footprint outside cities.
Japan Travel eSIM FAQ
Everything you need to know about using an eSIM in Japan
What is the cheapest eSIM for Japan?
Right now the cheapest option ranked by price per GB is SimSmash with 50 GB for 30 Days at $19.99. That works out to $0.40 per GB. Prices change often, so the table above is re-sorted at every price check.
Which is the best eSIM for Japan?
It depends on the trip, so we rank rather than pick a favourite. On today's prices the best value for Japan is SimSmash at $0.40 per GB, the lowest real rate of the 1835 plans we compare. For heavy daily use there are 708 unlimited plans, most with a daily fair use cap, and they only win if you genuinely burn several GB a day. Every pick on this page is the first row of a sort on live prices. No provider can pay to be named best.
Is eSIM available in Japan?
Yes. We track 1835 prepaid travel eSIM plans from 61 providers that work in Japan, roaming onto KDDI, KDDI/au, NTT docomo, Rakuten Mobile, SoftBank, Softbank, kddi. You need a phone that supports eSIM and is not locked to a carrier; most iPhones from the XS onward and most flagship Android phones from 2019 on qualify.
Which networks will my eSIM connect to in Japan?
The plans we compare connect to KDDI, KDDI/au, NTT docomo, Rakuten Mobile, SoftBank, Softbank, kddi. The exact network depends on the plan you pick. Check the plan details before you buy if one network matters to you.
Do Japan eSIMs support 5G?
1166 of the 1835 plans we track for Japan include 5G where the local network offers it. The rest run on 4G, which is still fine for maps, calls over apps, and video.
Can I buy a Japan eSIM online before I travel?
Yes, and you should. Every plan on this page is sold online and delivered by email as a QR code within minutes. Install it on wifi at home, leave the line switched off, and turn on data roaming for it when you land in Japan. The validity clock on most plans only starts when the eSIM first connects.
Can I top up my Japan eSIM if I run out?
Yes. 562 of the 1835 plans here support top ups, so you can add data without buying a new eSIM. The rest need a fresh plan once the data ends.
Is an eSIM cheaper than a local SIM card in Japan?
For a trip of days or weeks, usually yes. Data for Japan starts at $0.28 for 100 MB on this page, with no queue, no shop and no passport handed over at a counter. A local SIM card can still win if you stay for months or need a local phone number.
Will I still receive bank SMS and OTP codes?
Yes, if you keep your home SIM active. Travel eSIMs are data only. Your phone can hold both at once, so leave your normal SIM on for SMS and use the eSIM for data. Turn off roaming data on the home SIM to avoid charges.
Do these eSIMs include a phone number or calls?
The plans we compare are data only, so there is no local number. Calls work fine over WhatsApp, FaceTime, or any app that uses data. If you need a real local number, a local SIM is the better tool.
Does a Japan eSIM work on iPhone and Android?
Yes, on any carrier unlocked phone with eSIM support: iPhone XS or newer, Google Pixel 3 or newer, Samsung Galaxy S20 or newer and most recent flagships. The plans are identical on both; only the install steps differ, and both take about a minute on wifi.
How many GB do I need for a week in Japan?
Around 3 to 5 GB covers a week of maps, messaging, and normal browsing. Heavy video or hotspot use needs 1 to 2 GB per day. Today the cheapest plan with at least 5 GB is eSIMCard at $3.03.
Which Japan eSIM gives the most data per day?
Of the plans sold as unlimited here, SimSmash allows the most at full speed, 10 GB a day from $6.00. The smallest allowance on this page is 500 MB a day, from 8 sellers. Every one of them is advertised as unlimited, and past the daily allowance the speed drops, often to 1 Mbps or less, until the next day. Check the allowance, not the word.
Travelling further? Compare nearby destinations
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Or see every country on the cheapest eSIM index and track weekly movement on the eSIM Price Index.
How we rank
Prices last checked on 16 October 2026, 06:08 GMT across 1835 plans. Every plan is ranked by the true cost per gigabyte, not marketing claims. We do not take money for rankings, and providers cannot pay for a higher position. Read the full method on our how we rank page.
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