The best eSIM for Japan, worked out from your trip rather than a leaderboard

Compare our Japan plan types

Japan now has fixed data, daily high-speed and two unlimited families. The fixed and daily options below are part of the range. Seven days of unlimited at up to 10Mbps costs A$24.95 and includes 6GB of hotspot across the whole plan. Seven days of full-speed unlimited costs A$35.95 and has no separate hotspot allowance. Both unlimited families have a 60-day start window. Check the Japan selector and our unlimited guide for the exact terms.

Fixed data.

Daily high speed.

The 50GB over 180 days plan is worth a second look if you travel to Japan more than once a year. It is the only plan in our range built for repeat trips rather than a single holiday.

How to pick

One week, normal use. 5GB at A$14.95 is usually enough if you download offline maps before you go. If you would rather not think about it, 10GB at A$19.95 removes the question.

Two weeks, normal use. 10GB over 30 days at A$19.95. This is the one most people want.

Two weeks, heavy use. If you will be tethering a laptop, video calling home, or streaming on trains, 20GB at A$29.95.

Under a week, heavy use. Compare 3GB a day for seven days at A$22.95 with the fixed and unlimited options. Read the selected daily plan’s reset timing and reduced-speed terms. A daily allowance does not remove the need to check your likely usage.

A month or more. 50GB over 30 days at A$79.95.

Going back within six months. 50GB over 180 days at A$149.95 spreads across trips.

More detail with realistic usage figures: how much data you need for Japan.

Five things to check on any provider

Applies to us as much as anyone, and unlike a price table it does not go stale.

1. Which network the plan uses. In Japan this genuinely matters. Coverage between the main operators is comparable in Tokyo and Osaka and diverges in rural areas and mountains. Where a provider publishes the network, it is usually per plan rather than per brand, so read the plan rather than the homepage. On our Japan plans we publish supported networks on the plan itself where our supplier evidence supports it, and because those vary you should check the exact plan you are buying.
2. What currency you are charged in. Airalo served Australian dollars when we checked from an Australian browser on 1 September 2026. Ubigi served US dollars in our separate capture. Check your own checkout before you pay. Ours is Australian dollars throughout, and because The SIM Shop is not registered for GST, no GST is charged.
3. What happens after an allowance is used. A fixed plan has a total allowance and its own reload rules. Daily plans apply their stated daily allowance and reduced-speed terms. Our current Japan unlimited families have no total data cap or fair-use threshold, but differ in speed and hotspot allowance. Check the exact option rather than applying one rule to all unlimited plans.
4. When the plan starts. Our current Japan options start on first connection to a supported network. Unlimited options have a 60-day start window; some fixed and daily plans have longer windows. Read the exact option’s start rule and use-by before you pay.
5. Whether hotspot use is allowed and how it is counted. Japan’s up-to-10Mbps unlimited family has a separate 6GB hotspot allowance across the whole plan. The full-speed unlimited family has no separate hotspot allowance. Fixed and daily options have their own terms. Read the hotspot field for the exact option you select.

The alternatives, compared on how they are built

We could verify Airalo’s Australian prices directly. Their Standard tab listed 10GB over 30 days for A$26.00, against our A$19.95. Their Unlimited tab ran from A$16.50 for three days to A$98.50 for thirty days. Those are different plan shapes, so compare the fixed plan directly and read the fair-use rule before comparing unlimited with a data allowance. Other provider prices are not tabulated where we did not have an Australian capture.

For Airalo, check the exact Japan plan’s network, data structure, hotspot terms and total price. Read any rewards or refund conditions separately. Compare those stated terms with the alternative you would actually buy.

Ubigi is Transatel, owned by NTT, so there is a real network operator behind the brand. On their Japan 10GB plan they name KDDI and NTT Docomo, allow data sharing, and let you top up through their app even without wifi or remaining data. That last one solves the problem of needing data in order to buy data, which almost nobody else has answered. They publish a quantified reduced speed where their fair use policy applies.

For Travelkon, check the exact plan’s network, hotspot terms, reduced-speed wording and total price. Read current independent reviews directly, including the date and the service the reviewer bought.

For SimCorner, check the current Japan offer, whether it is a physical SIM or eSIM, and any delivery or installation requirements. Compare the exact plan and refund terms before paying. Read current independent reviews directly if they matter to your choice.

Holafly sells days rather than gigabytes. Their Japan unlimited plans ran from three days to thirty when we checked on 27 August 2026, in US dollars, and they publish a hotspot allowance of 1GB per day on trip plans plus a refund window of up to six months.

Flexiroam is listed on the ASX, sells both eSIMs and physical SIMs, and offers data sharing and a schedulable plan start.

Our dated multi-provider table and full methodology sit in travel eSIM prices in Australia.

Why buy from us

The whole range is visible before you pay, including the awkward middle rungs most comparison articles skip. Plan details including data, validity, hotspot support, when the plan starts and the supported networks are on the product page.

Australian dollars, with no conversion. The SIM Shop is not registered for GST, so GST is not charged, and the checkout total is the amount we charge you.

An Australian business you can look up. The SIM Shop Pty Ltd, ABN 50 699 035 704 and ACN 699 035 704, in Brisbane. Support is email, answered by me. Our refund policy and SIM Shop Credit terms are public pages.

For our Japan plans, check the exact option’s coverage, allowance, validity, speed and hotspot terms before buying. You can also read our public refund policy and company details. If reviews matter to your decision, open the current independent profile and read the recent feedback rather than relying on an old count here.

Before you fly: Visit Japan Web is recommended, not compulsory, and Japan Customs still accepts its paper customs declaration. We keep the official position and the phone requirement together in our Visit Japan Web guide.

Questions people actually ask

How much data do I need for a week in Japan?

Around 5GB for most people, and Japan runs heavier than other destinations because maps and translation apps are open constantly. Download offline maps before you fly and 5GB goes further.

Which network will I be on?

Where our supplier evidence supports it, the supported networks are shown on the plan itself. They vary by plan, so check the exact one you are buying rather than assuming it applies across the range.

Does it work on the shinkansen and in rural areas?

Coverage on the main Japanese networks is good along the shinkansen routes and thins in mountains and remote areas. This is the reason to care which network your plan uses.

When does my plan start?

The current Japan options start on first connection to a supported network. Check the selected plan’s use-by as well. Buy before travel and save your setup email. Wait until you have landed before tapping an install link, scanning the QR code, adding or activating the eSIM. Join working airport wifi and open a normal webpage to check the connection first. If it is unreliable, use hotel wifi or another steady trusted connection. Then install from your email and follow the selected plan’s instructions.

Can I use it as a hotspot?

It depends on the option. Japan’s up-to-10Mbps unlimited family includes 6GB of hotspot across the whole validity period. Full-speed unlimited has no separate hotspot allowance. Fixed and daily plans have their own hotspot terms, so check the selected option.

Will my phone work?

It needs eSIM support and must not be locked to an Australian carrier. Check both before buying from anyone, since a locked handset will not run a travel eSIM from any provider.

Do I keep my Australian number?

Yes. The eSIM is a second line, so your Australian SIM stays in the phone for calls and texts. Turn data roaming off on that line before you go.

Is a pocket wifi device better?

It suits a group sharing one connection and it is another thing to carry, charge and return. For one or two people an eSIM is usually simpler.

What if it will not connect when I land?

Turn data roaming on for the eSIM, set it as the mobile data line, restart. If that fails, email us. Full walkthrough at travel eSIM with no service after landing.

Sources

The SIM Shop Japan prices, plan structure, hotspot support and activation trigger from our Japan eSIM page and our product catalogue, checked 1 September 2026. GST position per the Australian Business Register, checked 1 September 2026. Competitor structural detail from each provider’s own live pages: Airalo Japan checked in an Australian browser on 1 September 2026, where the AUD prices and SoftBank network are shown; Ubigi Japan 10GB and Ubigi’s unlimited data FAQ, checked 27 August 2026, where KDDI and NTT Docomo are named; Travelkon Japan eSIM checked 27 August 2026, where “Coverage on KDDI”, hotspot support and the 128kbps reduced speed are published; Holafly Japan checked 27 August 2026. Airalo prices were read directly in AUD and not converted. Other competitor prices are not tabulated without an Australian capture. Review counts from ProductReview.com.au and our Trustpilot profile, checked 27 August 2026. Prices and terms change without notice.

Written by Lachlan, who runs The SIM Shop from Brisbane and answers the support email himself.