Staying Connected In Tokyo

Buy on days and data rather than on the brand. Two weeks of ordinary sightseeing use, meaning maps, messaging, a few videos and a lot of photograph uploads, sits comfortably inside 20 GB for one person.

Setting One Up Before You Fly

Read the unlimited tiers against the metered ones before you pay for them. Twenty gigabytes at $44.80 (¥6,908) covers two weeks for one person; fourteen days of unlimited at $53.80 (¥8,305) is nine dollars more for the right never to check. Sakura Mobile, which sells the same kind of product, publishes a travel eSIM from $8.10 (¥1,250) on its own site, so it is worth pricing both for your exact dates.

The practical steps are short and worth doing before you fly. Check that your handset supports eSIM and is not carrier-locked, because a locked phone will take the profile and refuse to use it. Buy online, receive the QR code by email, and install it while you still have Wi-Fi at home; most providers let you install early and activate on arrival. Keep your home SIM in place, switch data over to the Japanese profile when you land, and leave your usual number reachable for messages.

One thing an eSIM will not do is give you a Japanese phone number for calls, unless you buy a voice plan. For a restaurant reservation, an accommodation host or a lost-property call, an internet-calling app on the data plan is what most visitors use. If you specifically need a callable Japanese number, Sakura Mobile publishes voice-and-data plans from $19.31 (¥2,980) a month, which is a different product from anything else on this page.

A physical card is worth buying when your phone has no eSIM support, when it is locked to a home carrier that will not release it, or when you want a second device online without renting a router.

Two Rate Cards, One Product, Very Different Prices

That table is the most useful thing on this page, because the two operators price the same product on entirely different logic and the gap runs to tens of dollars for identical trips. Neither is hiding anything: NINJA WiFi sells mostly by data allowance and Japan Wireless mostly by days of unlimited use, and whichever shape matches your trip wins. Price your exact dates on both sites rather than taking a recommendation.

The setup is where a card can go wrong. Both operators publish the access-point settings you have to type in by hand, and they differ by network: on the Docomo network the access point is ppsim.jp with the user name ppsim and the password jpn, and on the au network it is a longer address with its own credentials, both with PAP or CHAP authentication. Neither is difficult, but a phone that will not connect after inserting the card is almost always a phone with an unfilled access point rather than a faulty card.

Two practical limits worth knowing. Data-only cards do not carry voice calls, so calls run through internet apps. And personal hotspot use on the premium 5G cards is capped by NINJA WiFi at 9 GB on the 10-day card, 15 GB on the 15-day and 30 GB on the 30-day, while the standard 4G cards do not support tethering at all. If your plan is to share the card with a laptop or a second phone, that limit matters more than the headline allowance, and it is the moment to consider a router instead.

Sakura Mobile publishes travel SIM cards from $22.70 (¥3,500), which sits above both operators above at the entry level but comes with airport and hotel collection points. Whichever you choose, order early: cards are posted or collected, and a card that arrives at your home address the day after you fly is money spent on nothing.

The arithmetic is per party, not per person. A single router covers every phone, tablet and laptop in the group, so divide the daily rate by the number of people before comparing it with an eSIM.

Sakura Mobile publishes pocket Wi-Fi from $1.94 (¥299) a day and a monthly router from $32.30 (¥4,980), which undercuts the daily ladder above at the entry level; as with the cards, price your own dates on both.

The drawbacks are physical rather than financial. The router is a second object to carry, charge and not leave in a hotel room, and its battery is the constraint on a long sightseeing day: several operators sell or include a power bank for exactly that reason. It also has to come back. NINJA WiFi's own terms let you collect at an airport counter, have the device delivered to a hotel, and return it at a counter, by courier or into an airport return box, which is the part of the transaction an eSIM does not have at all.

A note on where the reviews agree. NINJA WiFi publishes dated five-star reviews on its own rate page, and the useful ones are specific rather than enthusiastic: a family of four reported connecting every device and travelling into rural areas on the 5G unlimited plan, and another traveller on the cheapest 1 GB-a-day tier reported the allowance being sufficient for ordinary use on an older handset. Both descriptions match the arithmetic above, which is the only reason to quote them.

Roaming is the option this page cannot price for you, and that is not an oversight. No Japanese carrier publishes an inbound roaming tariff, because the price is set by your own operator at home, and home operators publish theirs in dozens of national variants that change with every plan revision. Japan's national tourism organisation says as much in its own visitor answers: whether your phone works here varies by provider, and the advice is to confirm compatibility with your own carrier before arriving.

So the useful version of this section is the list of questions to ask before you fly. Does my plan include Japan at no extra cost, and if so at what speed and up to how many gigabytes? What is the daily charge if it is not included? Does my phone support the Japanese networks, which run on Docomo, au and SoftBank infrastructure and are the same networks every visitor product on this page resells? And will tethering work on the roaming plan, or is it blocked?

The answers split cleanly. Travellers on plans that already bundle Japan, which is common on some North American and European carriers, should do nothing at all: you are already paying for it. Travellers facing a daily roaming charge should compare it with the eSIM ladder above, where two weeks of unlimited data costs $53.80 (¥8,305), and the comparison is usually not close. There is no middle case worth agonising over, and the whole decision takes one look at your carrier's app.

One caution that applies to everybody. Turn off automatic roaming before you land if you are buying a local plan, because a phone that quietly attaches to a Japanese network at the gate can spend more in the twenty minutes at passport control than the eSIM cost.

The city's network is run by the Metropolitan Government through Wire and Wireless, and Article 4 of its terms of use states plainly that no fee is charged for use of the service. What it charges instead is a small amount of setup and an identity.

• The service is OpenRoaming-compatible and also reachable through the Cityroam and eduroam networks, which means a device configured once keeps connecting without a new login at each spot.
• To register, connect to the SSID START_TOKYO_Wi-Fi at a location marked with the green TOKYO FREE Wi-Fi sticker; the setup site opens automatically.
• Registration authenticates you with a Google, Apple or LINE identity, then downloads a configuration profile you install on the phone. The site's own guidance puts the profile installation at about five minutes.
• There is no stated time limit on a session, which is unusual: many public networks cut you off at an hour.
• The profile can lapse after a year of inactivity, so a returning visitor may have to register again.
• Coverage is the spot map on the same site, at marked facilities and public phone booths, not a blanket over the city.

Beside the city network sit the operators' own. JR East advertises a JR-EAST Free Wi-Fi service from its English pages, and Keikyu lists free Wi-Fi among the services on its airport-access site, but neither published a terms or coverage page we could reach in Q3 2026, so we describe them as existing rather than quoting what they cover. Tokyo Metro's and Toei's visitor Wi-Fi pages returned errors or empty navigation shells on the same day, which is why this page carries no station-by-station Wi-Fi list.

The honest summary is this. Free Wi-Fi in Tokyo is better than in most cities and worse than a data plan. It is excellent in a station concourse, a department store, a public library and an airport terminal, and it is absent exactly where you need directions: the middle of a residential street at eleven at night with a phone at four percent. Set it up on the first morning because it costs nothing and it works, and buy data anyway.

Every visitor asks whether the phone works in the subway, and no operator we could reach in Q3 2026 publishes an answer. Tokyo Metro's own Wi-Fi and tips pages returned a not-found error when we fetched them, and Toei's equivalent returned its navigation shell without content. That leaves us describing the gap rather than filling it with a claim, which is the rule this whole site runs on.

What you can plan around instead is behaviour. Load the route before you go through the gate. Download the offline area map for central Tokyo in your map application, which removes the dependency entirely for walking directions. And screenshot the two or three things you will actually need underground, meaning the platform number, the exit number and the name of the station in Japanese characters, because an exit number is the single most useful piece of information in this city and the sign that carries it is always above your head.

On the apps themselves, the ones worth having are the official ones. Tokyo Metro publishes its own app, linked from its corporate site, which does route search and service status for its nine lines. Haneda Airport publishes HANEDA Navigator, which covers flight and facility search and terminal navigation, and is more use than it sounds when you are looking for the right ticket gate. The TOKYO FREE Wi-Fi site carries the spot map. Everything else, meaning route search across all operators, translation and payment, comes from the general app stores, and the two that matter most, a route planner and a translation camera, both work far better with the data plan you have just bought than without it.

One genuinely useful habit: keep a photograph of your accommodation's address in Japanese in your camera roll. It works when the data does not, it works in a taxi, and it works at a police box, and none of those three moments is a good time to be typing an address into a translation app.

This is the section where an honest guide stops short. We could not find a page on Japan's national tourism site or on the Tokyo Metropolitan Government's visitor site, read in Q3 2026, that publishes the country's voltage and socket type for travellers, and we do not reprint a figure from a blog as though it were official. What we can tell you is what to check and where.

Check your own charger first. The small print on the block of every modern phone, laptop and camera charger states the input range it accepts, and a charger rated for the full international range needs a plug adapter and nothing else. A device rated for a single voltage needs a converter, not just an adapter, and that distinction is the one that destroys hair dryers. Japanese sockets take a flat two-pin plug without an earth pin, so the adapter you want is small and cheap and sold in every electronics shop in Akihabara as well as at both airports.

Where to charge is easier. Hotels are the reliable answer and the only one worth planning around. Beyond them, coffee chains and the larger convenience-store seating areas often have sockets, airport lounges and terminal seating areas have them in quantity, and rental power banks from vending-machine style stands have spread across stations and convenience stores, though none of the operators publishes a national rate we could quote. If you are renting a pocket Wi-Fi router, treat its battery as the constraint on your day and carry a power bank for it; several rental operators include or sell one for exactly that reason.

The practical rule for a long sightseeing day is unglamorous and works: leave the hotel at a hundred percent, carry one power bank, and use the phone's low-power mode from the moment it drops below half. A dead phone in Tokyo is not dangerous, because this is a city of paper maps at every station exit and staff who will walk you to the right platform, but it is the fastest way to lose an afternoon.