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Software & Utilities / Internet & Mobile
ESIMJAPAN.com
A Japan travel eSIM store on KDDI's au network, with fixed data from $6.99 and truly unlimited 5G from $11.99 for 3 days. Shop data-only plans delivered by email, hotspot included.
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A Japan travel eSIM store on KDDI's au network, with fixed data from $6.99 and truly unlimited 5G from $11.99 for 3 days.
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At a glance
- Network
- KDDI (au)
- Fixed Data From
- $6.99 (3GB, 7 days)
- 4G Unlimited From
- $4.99 (3 days, 1GB/day)
- 5G Unlimited Max From
- $11.99 (3 days)
- Hotspot
- Free on all plans
- Phone Number
- Not included
- Valid Before Use
- 180 days
- Refund Window
- 3 months, unused eSIMs
Pros
- Runs on KDDI's au Network: Every nationwide plan connects to KDDI, and the 5G Unlimited Max plan runs 3 to 31 days with no stated daily cap, from $11.99 to $79.99.
- Plans for Every Trip Length: Fixed data runs from 3GB for 7 days at $6.99 to 50GB for 30 days at $59.99, and the 4G Unlimited Basic plan starts at $4.99 for 3 days.
- Hotspot and Long Shelf Life: Tethering is free on every plan, and an unused eSIM stays valid for 180 days after purchase, so you can buy well ahead of your trip.
Cons
- The cheaper 4G Unlimited plans give 1GB or 2GB of full-speed data a day and then drop to 384kbps, which one on-site reviewer found too slow, so heavy users should choose 5G Unlimited Max or a fixed plan sized to their needs.
- Refunds cover only eSIMs that have not been installed or scanned, within 3 months of purchase, and Trustpilot has no reviews of the store yet, so check that your phone is unlocked and eSIM-ready before you buy.
The Verdict
What sets ESIMJAPAN.com apart is a plan lineup built on one Japanese carrier rather than a roaming partner: Every nationwide plan connects to KDDI's au network, and the 5G Unlimited Max plan is sold as truly unlimited, with no daily cap or throttling, for 3 to 31 days. Because au supplies that plan directly, the store says you do not need to switch on data roaming. ESIMJAPAN.com is one of 18 destination stores in the ESIMWORLD.net network, run by HARRIE Inc., a company registered in Seoul, which also publishes its own Japan speed tests. The store's own reviews show 4.71 out of 5 from 1,044 ratings on the 5G plan and 4.56 from 1,312 on fixed data. The store also claims download speeds of up to 600Mbps on 5G and lists a free au Wi-Fi zone benefit, figures that come from its own testing rather than an independent lab. Prices are in US dollars. Fixed data runs from 3GB for 7 days at $6.99 through 10GB for 20 days at $14.99 to 50GB for 30 days at $59.99, and stops when the allowance is used. The 4G Unlimited plans come as Basic, with 1GB a day at full speed, from $4.99 for 3 days to $53.99 for 30 days, and Pro, with 2GB a day, from $6.99. 5G Unlimited Max costs $11.99 for 3 days, $27.99 for 7 and $49.99 for 15. The QR code arrives by email, plans start when you first connect in Japan, and an unused plan stays valid for 180 days. Top-ups are available from the QR code email on most plans, though not on the 15-, 20- and 30-day unlimited options, and every plan includes free mobile hotspot for a laptop or a second phone. There are trade-offs. Plans are data-only, with no Japanese phone number, and the 4G Unlimited tiers slow to 384kbps once the daily allowance is gone. Every plan is shown against a crossed-out original price about a third higher, so judge the actual price rather than the discount. Refunds cover unscanned eSIMs within 3 months, and the Trustpilot page is unclaimed with no reviews. Support is offered around the clock by email and WhatsApp, and faults must be reported while you are still in Japan. Check that your phone is unlocked, install the eSIM on Wi-Fi before you fly, and choose 5G Unlimited Max if you stream or tether a laptop.
Japan Travel eSIMs on KDDI's au Network, From Fixed Data to Unlimited 5G
ESIMJAPAN.com sells prepaid travel eSIMs for Japan, plus Japan-Korea, East Asia, Asia and global plans and city plans for Tokyo, Osaka and Sapporo. Its terms, privacy policy and About page name the operator as HARRIE Inc., a Seoul company at 49 Dongmak-ro 8-gil, Mapo-gu (Korean business registration 623-86-00369), which runs 18 destination stores under the ESIMWORLD.net name and the FLIT eSIM app.
Fixed Data costs $6.99 for 3GB over 7 days, $14.99 for 10GB over 20 days and $59.99 for 50GB over 30 days. 4G Unlimited Basic, with 1GB a day at full speed and 384kbps after, costs $4.99 for 3 days and $12.99 for 10 days, while 5G Unlimited Max runs from $11.99 for 3 days to $79.99 for 31 days.
All nationwide plans use KDDI's au network, include free hotspot and are data-only, with no phone number. The QR code is emailed after payment, the plan starts when you connect to a Japanese network, and an unused plan stays valid for 180 days; top-ups are offered on most plans but not on the 15-, 20- and 30-day unlimited ones.
Refunds go back to the original payment method, within up to 30 business days, if the eSIM has not been installed or scanned and you ask within 3 months; problems must be reported to support while you are still in Japan. Support runs 24/7 by email and WhatsApp. The store's own reviews average 4.5 to 4.7 out of 5 across thousands of ratings, but its Trustpilot page is unclaimed with no reviews, so the independent record is still thin.
ESIMJAPAN.com: what to know before you buy
ESIMJAPAN.com sells Japan-only travel eSIMs on KDDI's au network, from small fixed-data plans to 5G Unlimited Max, with QR codes emailed after purchase.
Plans and prices
Fixed Data: $6.99 for 3GB over 7 days, $9.99 for 5GB over 15 days, $14.99 for 10GB over 20 days, $35.99 for 30GB over 30 days and $59.99 for 50GB over 30 days. Data stops when the allowance is used.
4G Unlimited: Basic gives 1GB a day at full speed, from $4.99 for 3 days to $53.99 for 30 days; Pro gives 2GB a day, from $6.99 for 3 days. Both slow to 384kbps after the daily allowance.
5G Unlimited Max: no stated daily cap, $11.99 for 3 days, $27.99 for 7, $49.99 for 15 and $79.99 for 31.
Nearly every plan is shown against a crossed-out original price about a third higher, a standing discount, so judge each plan by its actual price rather than the saving.
Activation and setup
Your phone must be carrier-unlocked and eSIM-capable. Install the eSIM over Wi-Fi before you fly; the plan's days start only when you connect to a Japanese network, and an unused plan stays valid for 180 days.
Plans are data-only with no phone number. Hotspot is free. Most plans can be topped up from the QR code email, except the 15-, 20- and 30-day unlimited plans.
Refunds, support and reviews
Refunds are available within 3 months if the eSIM was never installed or scanned, or if a problem you report while in Japan is confirmed as the store's fault. Money goes back to your original payment method within up to 30 business days.
Support runs 24/7 by email and WhatsApp. The store's own reviews average 4.5 to 4.7 out of 5, but Trustpilot lists no reviews yet.
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ESIMJAPAN.com: questions people ask
Straight answers about ESIMJAPAN.com, then how this review was written and stays independent.
Is ESIMJAPAN.com legit?
Yes. ESIMJAPAN.com is run by HARRIE Inc., a registered Seoul company that operates 18 ESIMWORLD.net destination stores, and its plans run on KDDI's au network. The store's own reviews average 4.5 to 4.7 out of 5 across thousands of ratings, though its Trustpilot page has no reviews yet.
Which network does ESIMJAPAN.com use?
Its nationwide Japan plans use KDDI, the au network. The 5G Unlimited Max plan is supplied directly by au, so the store says you do not need to turn on data roaming for it.
Is ESIMJAPAN.com unlimited data really unlimited?
It depends on the plan. 5G Unlimited Max is sold with no daily cap or throttling. The cheaper 4G Unlimited plans give 1GB (Basic) or 2GB (Pro) a day at full speed, then slow to 384kbps until the next day.
Can I get a refund from ESIMJAPAN.com?
Yes, if the eSIM has not been installed or its QR code scanned and you ask within 3 months of purchase. Refunds go to the original payment method and can take up to 30 business days. Report any connection problem to support while you are still in Japan.
Does ESIMJAPAN.com allow hotspot?
Yes. Every plan includes free mobile hotspot, so you can share data with a laptop or a travel companion's phone.
Is this ESIMJAPAN.com review sponsored?
No. ESIMJAPAN.com did not pay for this write-up, see it before publication, or have any say in the verdict. If we earn anything it is a commission after you buy, and it comes out of the merchant’s margin rather than your price.
How was the ESIMJAPAN.com assessed?
By using it and by checking the claims made about it against what it actually does. Where our time with something has been limited, the review says so rather than implying more testing than happened.
What else have you reviewed in Software & Utilities?
Everything in Software & Utilities sits in the review library, where you can filter by budget and sort by rating, price or how recently it landed.
Do you update reviews after publishing?
Yes — when a product changes, when a price moves for good, or when we get something wrong. Corrections are made on the piece itself with a note saying what changed.
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