Editorial & Advertising Policy

Japan Travel Dobbo compares eSIM and data options for travellers to Japan. This page sets out where our numbers come from, how we compare plans, how articles are made and how advertising is handled.

Where the numbers come from

• Plan prices, data allowances, validity, network and tethering rules come from each provider’s published pages. Every figure carries the date it was checked. Where a provider does not publish a detail we say so rather than guess.
• Coverage and speed statements come from the Japanese carriers’ published maps and from the provider’s own stated network partner, not from our own measurements unless an article says so.

How we compare and rank

• Plan tables compare published facts side by side: price per GB, validity, network, tethering, activation method and support language. Where we order plans, the criteria are stated on the same page.
• Pocket Wi-Fi, SIM cards and eSIMs are described by what they are good for, not ranked against each other overall.

What we do not do

• We do not invent testing. We do not describe speed or coverage we did not measure
• We do not state that a plan is available or at a price without a checked date.
• Quotes from travellers are cited to their source. We do not write reviews ourselves
• We do not run companies or services down. Differences are described as “who this suits”, not as faults.
• We do not use fear or urgency. No “only today” or “guaranteed savings”. Deadlines appear only when the provider publishes them, with a source.

Advertising and how commissions affect us

• This site contains affiliate links. If you click one and then buy or sign up, we may receive a commission from the provider or an affiliate network. That is how the site is funded. The price you pay does not change.
• Pages that contain affiliate links say so near the top, and buttons that lead to a provider are styled so you can tell they are advertising. This disclosure is written to satisfy the US FTC endorsement guides and Japan’s rules on undisclosed advertising.
• Whether or how much we are paid never changes the order, the scores, the contents of a comparison table or the conclusion of an article. Providers we have no relationship with appear in the same tables by the same criteria. We do not take instructions from advertisers about content or ranking.
• That said, the “start here” buttons and recommendation cards placed in or at the end of an article are chosen from the providers we are able to link to (those with an affiliate programme). That is a choice about which provider to point to, not about rank or score.
• If a provider ever pays us to write an article, that article will be labelled “Sponsored”. There are currently no such articles.

How we use AI

We use AI tools to help research, draft and translate. Every article is then checked against the Japanese source before publication, and only figures we could verify are published. Some pages carry an AI question tool; its answers are drawn only from information this site has already verified. Responsibility for what is published rests with the editorial team, not with the AI.

Quotations and third-party material

• When we quote a review or an opinion, we cite its source (site name and URL) and do not alter the wording. We never invent reviews.
• Quotations are kept short and incidental to our own text. Photos and figures are our own, licensed, or used under terms we can comply with.
• If you hold rights in something we have quoted or shown and object, tell us through the contact form with the subject “Rights claim / legal notice”. We will review and correct, remove or add attribution.

Usage records

To improve the site we record only that a page was viewed, that a tool was used or that a provider link was clicked, with a temporary number that disappears when you close the tab. No names, contact details, typed text or IP addresses. See the Privacy Policy.

Corrections and removal requests

If you find an error or an outdated figure, send the page URL through the contact form. We verify, correct and show the update date on the page. We aim to acknowledge within five business days, but do not undertake to reply to every message.

Publisher: Japan Travel Dobbo editorial team (About this site) / Established: 13 October 2026 / Last updated: 10 November 2026