eSIMCard in Japan: we read its site, and pulled our three prices

The prices on this page are gone, and not because we ran out of time

This review used to open with three eSIMCard figures — 5 GB, 10 GB and 20 GB, all over thirty days — and rank each one against its rivals. Those rows have been withdrawn. They are no longer in the plan table on this page, and they no longer appear in the cheapest-per-gigabyte ranking anywhere on this site.

The label they carried until now was indicative: our figure, not read off a live checkout, but probably in the right area. That label is what turned out to be wrong. On 18 August 2026 we opened eSIMCard's own Japan page and read it. Our three rows match neither of the two tiers eSIMCard actually sells at those sizes, and the entry-level plan our data listed at one identical price across fifteen unrelated countries sells in Japan for well under half of it.

"Indicative" implies a number that might be roughly right. We have direct evidence that ours were not. So they are withdrawn, which is a stronger statement than unchecked, and the honest one.

Why we did not simply put the real prices in

Because we cannot store them. Our records hold a plan as four things — provider, gigabytes, days, price — and eSIMCard's Japanese catalogue does not resolve to four things.

There are more than sixty Japanese plans on its site, where we held three. The same size over the same number of days appears at two or three different prices, because the plans differ along axes we have nowhere to put:

• Standard or Universal. A toggle at the top of the page swaps the entire catalogue between two product lines.
• A per-plan speed limit. Every plan carries a Speed Limit flag, and it sits inside that plan's View Details modal rather than in the page text — visible for about one plan in sixty without opening each one by hand.
• Carrier sets that vary by plan. Two plans covering the same country can name different host networks.

Recording one price per size would have flattened a throttled Universal plan and a full-speed Standard plan into a single row asserting they are the same product. That is the exact class of quiet error this site is being rebuilt to remove. The full reasoning is on our eSIMCard page.

Two ways out exist: an extra field for plan type, or a reader that opens every plan's details modal — about nineteen hundred of them across the countries we cover. Until one of those happens, eSIMCard appears here with a description and no price.

What Japan costs, so you can price its offer yourself

This is the useful half of the page. Take these numbers to eSIMCard's checkout and judge what you find there against them. Every figure below was read off the seller's own site: Airalo and Saily on 13 August 2026, Nomad on 17 August 2026.

Short trips are cheaper still: Saily's verified 1 GB over seven days is $3.99, Airalo's verified 1 GB over three days is $4, and Airalo's verified 3 GB runs $7.50 for three days or $8 for seven.

Nomad's 50 GB month at $35 is the cheapest data in our entire Japan set, at seventy cents a gigabyte. If an eSIMCard plan beats these on price for the size you need, buy it — we simply cannot tell you in advance whether it does.

For uncapped data, Airalo's verified ladder runs $11.50 for three days to $69 for thirty, Holafly's verified ladder $11.90 to $73.90, and Nomad's verified uncapped plans cover three, seven, fourteen and twenty-one days.

The one thing eSIMCard does that no rival does

It tells you whose network you will be on.

Its Japan page names KDDI, NTT Docomo and SoftBank against its plans, in a block headed Supported Countries & Networks. Of the six sellers on this site, it is the only one that publishes this. We read the others directly and none of them names a Japanese operator anywhere — where our own tables once showed a carrier against their rows, the name came from this site's generated text rather than from the seller. eSIM Go has no consumer page on which it could publish one.

An earlier version of this page said eSIMCard published no Japanese host network. That was our error, and it is corrected here: the disclosure is real, it is on the page, and it survived the price check untouched.

One caveat on how to read it. The carrier list belongs to the plan, not to the country — its one-gigabyte one-day plan names KDDI alone, while its one-gigabyte three-day plan names four operators. So it tells you what a specific plan can attach to, not that every eSIMCard plan reaches all three.

Is eSIMCard the same case as eSIM Go?

No, and the two should not be bracketed together.

eSIM Go sells wholesale to resellers. There is no basket on its site, no checkout and no consumer price at all, so the rows we hold for it are figures no traveller can pay — see our eSIM Go page. Reading it harder would not fix that.

eSIMCard is a shop. It has a working storefront, real Japanese prices and a checkout you can complete, and its range is far wider than our three rows ever suggested. The gap here is in our records, not in its product.

How much data a Japan trip takes

Unchanged by any of the above, and worth having before you compare prices anywhere. Live navigation, messaging, transit apps and photo uploads run most travellers 500–700 MB a day, with hotel and convenience-store Wi-Fi soaking up the rest.

On that pattern, 3 GB covers a short Tokyo stay, 5 GB a comfortable week, 10 GB a fortnight, and 20 GB or more is for tethering a laptop or staying a month. Japan's networks all clear 97% population coverage with a national average near 50 Mbps, so along the Tokyo–Kyoto–Osaka corridor any of them is fine; off it, knowing what you are attached to is worth something, which is where eSIMCard's disclosure earns its keep.

The local alternative is a Japanese prepaid SIM at about $12 from an airport counter, with a passport required at registration. An eSIM bought before you fly skips that desk entirely.

Verdict

We have no price for eSIMCard in Japan and will not print one until we can store its catalogue properly. That is a gap in our data, not a verdict on the seller.

What we can say: it is a real shop with a much larger Japanese range than this page ever showed, and it is the only one of the six that will tell you which network your plan uses. What we cannot say is whether it is good value, because the figures we had for that were wrong.

If you want a plan whose price we stand behind today, the table above is where to start, and the Japan hub puts every seller we can still price side by side.