Japan is probably the country where you need your phone most while traveling, and where the local solutions are the most counterintuitive. Two rules completely change the game there compared to the rest of the world: tourists cannot get a Japanese phone line, and portable Wi-Fi devices are a full-fledged industry rather than a last resort. Here's a breakdown of the four options, along with their real drawbacks.
Why is the question posed differently in Japan?
The first peculiarity, and it always surprises people, is that in Japan, visitors cannot subscribe to a mobile phone plan with a phone number. The law requires identity verification linked to a resident card, which, by definition, tourists do not possess. Therefore, all offers available to visitors are data-only plans, without a Japanese number, and without local calls or SMS messages. This is not a commercial choice; it is a legal requirement.
A second distinctive feature: the pocket Wi-Fi device, the famous pocket Wi-Fi, is a mature market in Japan, with its airport counters, hotel deliveries, and returns via mailbox. Elsewhere, it's a fallback solution. In Japan, it's a serious competitor, and for certain types of travelers, the best choice.
Thirdly, and perhaps more mundane but crucially important: a trip to Japan involves a tremendous amount of navigation. Travel is primarily by train, with connections requiring precise timing, platform numbers to check, and station exits numbered down to the letter. Google Maps is constantly running, as is the option to translate using your camera. Your phone isn't a convenience; it's your primary means of transportation.
Finally, there's the entry formality. Japanese immigration and customs procedures now involve online pre-registration, which generates QR codes to be presented upon arrival. In other words, being connected when you get off the plane is no longer optional. This procedure is subject to change, so it's best to check its exact status a few days before departure.
Free Japanese Wi-Fi, and why it disappoints
Japan has a reputation for being ultra-connected, and on paper public wifi is indeed everywhere: train stations, convenience stores, cafe chains, department stores, tourist offices.
In practice, the experience is frustrating. Each network requires its own registration, often with an email address and verification. Sessions expire regularly, sometimes after just an hour, forcing users to constantly reconnect. And numerous Japanese captive portals still appear in an interface that hasn't changed much in ten years.
Above all, this Wi-Fi is inherently static. It's useless between train stations, on a train, on a Kyoto street looking for a temple, or in front of an ATM that rejects a foreign card. Yet it's precisely in these moments that we need to be connected. Free Japanese Wi-Fi is perfect for an evening in a hotel, but unusable for getting around.
How much data should be expected?
Japan consumes more than most destinations, for a mechanical reason: navigation is constant there.
A typical day for an active visitor uses around 1 to 1,5 GB of data. This includes using Google Maps while navigating public transport, translating menus or signs with the camera, searching for restaurants, and making last-minute reservations. Over two weeks, 20 to 30 GB of data is more than enough, including hotel Wi-Fi.
What causes a data plan to skyrocket remains the same everywhere: video streaming on the Shinkansen and automatic photo backups. A trip to Japan easily generates several hundred photos a day, and the phone rushes to send them to the cloud as soon as it gets a signal. Switching backups to Wi-Fi only before leaving solves the problem in thirty seconds.
The four solutions, and their value
| Solution | What it brings | The problem lies here. | For who |
|---|---|---|---|
| Free Wifi | Free, available indoors | Network registration, short sessions, stationary | A complement, never a single solution |
| pocket wifi | Shared between multiple devices | Case to charge, collect and return | Family, group, long stay |
| SIM local data | Good price per gigabyte over time | Withdrawal of French card, no Japanese number | Long stay, telephone in one location |
| eSIM | Active upon landing, French number retained | Compatible and unlocked phone required | Traveling alone or as a couple |
The pocket wifi
A device the size of a deck of cards, which broadcasts a private Wi-Fi network for five to ten devices. It is reserved before departure, picked up at an airport counter or delivered to the hotel, and returned in a prepaid envelope upon departure.
Its advantage is simple: for three or four people, a single subscription connects everyone. The cost per person becomes unbeatable, and the data allowances offered are generally generous.
Its drawbacks are just as significant. It's yet another device to charge every night, with a battery life that rarely lasts more than a day of heavy use. Most importantly, it requires you to never leave the group: anyone who goes off to explore a neighborhood on their own will find themselves offline. And you have to think about returning the equipment, or you'll incur costs. For a solo traveler, this equation simply doesn't work.
The local data SIM card
You can find them in airport vending machines, at major electronics retailers, and in some train station shops. The price per gigabyte becomes attractive for stays longer than two or three weeks.
Two limitations to be aware of. The first is legal, as mentioned above: these cards do not provide any Japanese phone numbers, only data. The second is practical. On a phone with a single SIM slot, inserting the Japanese card means removing the French card. Say goodbye to bank SMS messages, two-factor authentication, and calls to your usual number—precisely when a hotel reservation or online payment might be needed.
The eSIM
The profile is downloaded from France before departure, and the line activates automatically upon landing at Narita, Haneda, or Kansai airports. It's the only system that allows you to be connected the moment you present your immigration QR codes.
The decisive advantage in Japan lies in the dual line. The eSIM occupies a virtual slot, so the French SIM card remains in place and continues to receive calls and SMS messages. In a destination where you don't have access to a local number anyway, keeping your own becomes the only way to stay reachable and complete bank authentication.
The key point to consider before buying is not the price displayed, but the network used. Japan eSIM Backed by a robust infrastructure, it will cover everything from Tokyo to a valley in the Kansai region, whereas an offering based on a newer network will show its limitations as soon as you leave the major cities. This is the criterion that separates a good offer from a bad one, far more so than the advertised data allowance.
The requirement is well-known: the phone must support eSIM and not be locked to a specific carrier. iPhones from the XS onwards and most recent mid-range and high-end Android phones are compatible. Dialing *#06# and searching for an EID number in addition to the IMEI resolves the issue in ten seconds.
Roaming on your French plan
First thing to check, it doesn't cost anything. Japan is rarely included in the zones covered by French mobile plans, unlike some North American destinations, but a few premium offers do cover it with a decent data allowance. If that's the case, the discussion ends there. Otherwise, you should turn off your data abroad before takeoff, because out-of-plan charges in Japan are particularly steep.
The criterion that nobody looks at: the network used
Four operators share the country: NTT Docomo, KDDI au, SoftBank, and Rakuten Mobile. The first three operate legacy networks with excellent coverage, including in mountainous and rural areas. Rakuten, which arrived much later, remains weaker outside major urban centers.
For a trip to Tokyo, Kyoto, and Osaka, the difference is negligible. It becomes very real if the itinerary includes Mount Koya, the Japanese Alps, Tohoku, Shikoku, or the villages of Shirakawa-go. Before buying anything, you should therefore check which network the offer is based on. Reputable retailers will indicate this, while others remain vague, and this vagueness is itself a sign of things to come.
One last point, which falls under the category of non-issues: the connection drops out in the Shinkansen tunnels. This is normal, it affects everyone, and the onboard Wi-Fi partially takes over on the main lines.
The detail that no one anticipates: the transport card in the phone
Japanese transport cards, primarily Suica and Pasmo, can be added to the digital wallet of a compatible iPhone or Android device. They can then be used almost everywhere: trains, subways, buses, station lockers, vending machines, convenience stores, and a large number of small shops.
The practical consequence often goes unnoticed. Topping up this card from your phone requires a data connection. Finding yourself at a train station gate with a zero balance and no network access is an unpleasant scenario, especially during rush hour in Shinjuku. Having some extra credit on hand, or a reliable connection, amounts to the same thing: you need to think about it beforehand.
Which solution depends on your trip?
| Profile | Solution | Why are |
|---|---|---|
| Solo traveler, 1 to 3 weeks | eSIM | Connected upon landing, French number retained, nothing to return |
| Couple | eSIM on both phones | Each person remains autonomous, with no dependence on the other. |
| Family or group of 3 or more | pocket wifi | One subscription for everyone, unbeatable cost per person |
| Stay of more than one month | SIM local data | Ultimately, the price per gigabyte makes the difference. |
| Rural or mountain route | eSIM or SIM on legacy network | Coverage is more important than price; check with your support provider. |
F.A.Q
Is it possible to have a Japanese phone number as a tourist?
No. The identity verification required by Japanese regulations relies on a resident card. Services available to visitors are limited to data. Therefore, keeping your French number, which an eSIM allows, is the only way to remain contactable.
Is the Wi-Fi in Japanese hotels reliable?
Yes, generally very good, including in budget and business hotels. The problem isn't the quality but the portability: it doesn't work on the street or on trains.
Should I get a pocket wifi AND an eSIM?
For a group that regularly splits up during the day, the combination makes sense: the base station for the common connection, a lightweight eSIM on each person's phone. For a trip for two, it's wasteful.
What happens if the eSIM does not activate upon arrival?
This is the only real risk with this solution, and it can be prevented. You must install the profile at home, with a stable connection, several days before departure, and verify that the line appears in the settings. Network activation will then occur automatically upon landing.
In Summary
For a trip for one or two people, an eSIM installed before departure solves everything: immediate connection upon exiting the plane, French number retained, no equipment to collect or return. For a family or group that stays together, pocket Wi-Fi remains a real economic advantage. For a long stay, a local data SIM card ultimately proves more cost-effective.
In any case, the question to ask before paying remains the same: which Japanese network does the offer rely on? This will determine whether the phone still works deep in a Kansai valley, or only on the main boulevards of Shibuya.
