Pocket WiFi in Japan (2026): Japan’s Regulator Says Your Own Router Isn’t Covered by the 90-Day Rule

There is a claim in almost every English guide to staying connected in Japan: that a 90-day exemption lets you bring your own wireless equipment, routers included. Japan's Ministry of Internal Affairs and Communications answers that exact question on its own portal, and the answer is no. Routers need the technical conformity mark. Below: what the regulator actually says, what renting costs from the operators' own pages — including one that publishes no usable price at all — and the return trap that strands people on the wrong side of security.

Pocket WiFi in Japan at a glance

Collection and return at the airport, shown end to end:

🚨 The law: the 90-day rule does not cover routers

What this means in practice

If you rent in Japan, none of this is your problem — the device is domestically certified and carries the mark. The exposure is for travelers who pack their own router because an article told them the 90-day rule covers it. The ministry's wider guidance is not gentle on the point either: it warns to be very careful using radio equipment without the mark, as it may be unlicensed or illegal. We are not going to tell you what enforcement looks like in an airport, because the ministry does not say. We are telling you what the rule is.

What it costs — with an honest caveat about comparing

WiFiBOX: the clearest pricing we found

It is the only operator we read that states tax status at all, and the model is unusual: unmanned kiosks. Scan a QR code, the device drops out, and you return it by slotting it into any WiFiBOX machine — no counter, no queue, no opening hours. The hardware is five devices, twelve hours, 186 grams. Note the wording on the 840-yen tier: "Unlimited (3GB)" throttles to 1 Mbps once you pass 3GB in a day. Only the 1,390 tier is sold as genuinely uncapped.

Sakura Mobile: priced by trip, not by day

¥6,300 for four days, ¥9,900 for seven, ¥37,500 for thirty — and the ladder is perfectly linear once you see it: 6,300 at four days, then 1,200 yen for each additional day. That makes it easy to price any trip length yourself. What the page does not say anywhere is whether these include tax, so we are not going to assert that they do. It also states that payment is processed in yen only, with other currencies shown for reference and subject to your card company's rate.

Japan Wireless: no price we can responsibly quote

This one is worth explaining, because it shows why comparison tables are unreliable. The rates page loads fine — but the prices are injected by script and simply do not exist in the page. The only figures actually present in the served page are "US $4.7/day~" on the homepage and, buried in its structured data, "starting from $3.60" — two different numbers, the second carrying an expiry date that has already passed. So we will tell you what the site does state clearly: the ONE Plan is advertised as truly unlimited with no fair-use policy, it connects up to eight devices, and it ships with two power banks and a prepaid return envelope you can drop in any postbox in Japan.

The costs that are not in the headline rate

Insurance is a daily charge with a ceiling

WiFiBOX charges 198 yen a day for 80% coverage or 330 for full — on the 300-yen plan, that more than doubles your cost. And the coverage caps at 15,000 yen, which is precisely the amount WiFiBOX bills if the device is never returned. Japan Wireless frames it through the downside instead: a lost router and SIM is 40,000 yen uninsured, 20,000 on the standard plan and nothing on the top tier. Note one classification in their table — a cracked screen counts as fatal damage and triggers the full loss fee, not a repair charge.

Late returns, and canceling before you even travel

WiFiBOX adds one day's rent for every day past your return date, then declares it lost after seven days and charges 15,000 yen. Japan Wireless charges 550 yen a day for up to two months, and has a documented process for travelers who got home with the router still packed — courier it to their Shimbashi delivery center, late fee still applies. Canceling early is not free either: Japan Wireless deducts a 1,100-yen penalty once an order has shipped, and WiFiBOX sets its cancellation deadline at 23:59 Japan time on the day you receive the device.

The card that will not work

WiFiBOX accepts Visa, Mastercard, American Express, JCB, Diners Club, Discover, Apple Pay, Google Pay and PayPay — and states plainly that prepaid cards are not supported. If you travel on a prepaid travel-money card, that is a booking that will fail. On the positive side, it confirms no card surcharge: the amount at booking is the amount charged.

Collecting and returning it without losing money

🚨 Post it before security. There is no postbox after

Sakura Mobile states it directly: there are no postboxes or post offices after the security and passport checkpoints, and you must return your package before going through. Since most rentals come with a prepaid envelope for exactly this, the plan fails entirely if you clear security first — and by then the fee clock has started. Narita's own guidance matches the geography from the other direction: its rental and SIM counters exist only in the area before departure passport control.

Counter hours are narrower than you think

The picture at Narita: most counters run 07:00 to 21:00, with the JAL ABC desks the useful exception at 06:30 until an hour after the last international arrival. Haneda runs later — the WiFiBOX store in Terminal 1 is 05:00 to midnight, and while the Mobile Center in Terminal 3 closes at 23:00, the airport notes there is a 24-hour unmanned rental service in front of the store. Japan Wireless gives the sensible rule for a late arrival: if you land less than two hours before closing, have it delivered to your accommodation instead. Order lead time matters too — the same operator says packages arrive a day early when you book three days ahead. And bring your passport; it is required at pickup.

Two Narita traps worth knowing

Both from Sakura Mobile's own page, and both easy to walk past. It has no counter at Terminal 3 at all — Terminal 3 arrivals must collect at Terminal 2. And at Terminal 1, its orders can be collected only at the South Wing JAL ABC desk; the company states outright that they cannot be picked up at the North Wing counter. Those two wings are a long walk apart with your bags.

Router or eSIM?

The honest structural difference is the return. An eSIM has none — Sakura's own wording for its SIM products is that you simply dispose of it after use, with no need to return it — which deletes every late fee, loss charge and postbox-before-security problem in this article at a stroke. Against that, a router shares to five or eight devices, requires no compatibility check against your handset, and never touches your phone's settings. As a rough split: a solo traveler with an unlocked, compatible phone is usually better served by an eSIM; a family, a group, or anyone who would rather not change any settings on their phone is better served by the router. Neither choice affects the legal point at the top of this article, because both are provisioned inside Japan. While you are planning the practical side of arrival, our Suica guide covers the other thing you will want within an hour of landing, and luggage storage covers what to do with your bags before check-in.

FAQ

Sources

The legal position on foreign devices, the technical conformity mark and the scope and duration of the visitor exemption: the Ministry of Internal Affairs and Communications' radio-use portal, English pages. Plans, prices, tax statements, insurance terms, late-return fees, cancellation deadlines, accepted payment methods and device specifications: the official sites of WiFiBOX (Telecom Square), Japan Wireless and Sakura Mobile. Counter locations, opening hours and the note that rental counters sit before passport control: Narita International Airport and Tokyo International Airport (Haneda) official facility listings. All read on August 24, 2026. Rental prices and terms change frequently; confirm with the operator before booking. The embedded video is by its creator.

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