To get internet in Japan, you have three options: an eSIM, a physical SIM or a pocket Wi-Fi. For most travellers the eSIM wins: buy it online before you fly, connect the instant you land, nothing to carry or return. Japan’s networks cover 99.9% of the population on 4G. A pocket Wi-Fi only makes sense for a group sharing one device, and public Wi-Fi is too patchy to rely on. Budget 3–5 GB a week, you will use more than you think.
Japan runs on your phone more than almost anywhere. You will navigate deep stations, translate menus in real time, chain train connections and read reviews before you eat. Lose your data and half the trip gets harder. So the question is not whether to stay connected, but how.
Here are the three real options, what each one actually costs you in hassle, and the one I would pick for most trips.
The three options compared
| eSIM | Physical SIM | Pocket Wi-Fi | |
|---|---|---|---|
| Set up | Online, before you fly | At the airport or a shop | Collect & return a device |
| Ready on landing | ✓ Instantly | After fitting the SIM | Once collected |
| Carry a device | No | No | Yes, and charge it daily |
| Best for | Every kind of trip | Phones with no eSIM support | Groups sharing |
The eSIM
An eSIM is a SIM built into your phone, activated by scanning a QR code. There is no plastic card and nothing physical to pick up. You buy it online before you leave, install it in a couple of minutes, and it switches on automatically when you land in Japan, while your home number stays available for calls and texts on your normal SIM.
For a short trip, this is the cleanest option by a distance. No airport queue, no hunting for a shop, no device to keep charged. The only requirement is an eSIM-compatible phone, which covers essentially every recent iPhone and most recent Android handsets.
The physical SIM
A traditional plastic SIM you slot into your phone, swapping out your usual one. You can buy tourist SIMs at the airport on arrival or order one to collect. They work fine, and a data-only tourist SIM does not give you a Japanese phone number, which is normal for short visits.
The drawbacks are practical. You queue on arrival, fiddle with the tiny card (and risk losing your home SIM), lose your usual number for the trip, and you are offline in the gap between landing and getting it set up, exactly when you most want a map. It only earns its place if your phone has no eSIM support; otherwise an eSIM does the same job without any of that friction.
Pocket Wi-Fi
A pocket Wi-Fi is a small portable router that broadcasts a Wi-Fi signal for several devices at once. You rent it for the trip, collect it (often at the airport) and return it at the end.
It has one genuine strength: if four people travel together, they can all share one connection and split the cost. But the downsides are real and add up. You have to carry the device and keep it charged all day; if the battery dies, everyone is offline. Leave it in the hotel by mistake and you are disconnected on the street. And it ties the group together, no one can wander off with data. For solo travellers and couples, it is more trouble than it is worth.
Public Wi-Fi and its limits
Japan has free public Wi-Fi in stations, convenience stores, cafes and some trains, and it is fine as a top-up. As your only plan, though, it falls short.
It is patchy, often demands a sign-up or an app, and, crucially, it vanishes the moment you step outside to actually navigate. The times you most need data, finding the right exit from a vast station, translating a sign, checking the next train, are exactly when there is no hotspot in reach. Treat public Wi-Fi as a bonus, never the backbone.
How much data you need
People consistently underestimate this, because maps, translation and train apps run almost non-stop. A rough guide:
- 3–5 GB per week for free use: constant maps, translation, social media and the occasional video.
- Around 1 GB per week if you lean on hotel Wi-Fi each evening and only use data on the move.
On coverage, the networks reach 99.9% of the population on 4G, with strong 5G in the cities. The grey zones are deep metro tunnels, rural Hokkaido and the high Alps. Reach varies between operators in the mountains and remote areas, which is why network coverage matters more than a headline speed figure. The Orange Travel eSIM handles this for you: thanks to roaming agreements with the Japanese operators, it leans on whichever local network performs best where you are.
Where the signal drops
Coverage is excellent, but it is not perfect, and knowing the grey zones in advance saves frustration:
- Deep metro tunnels. In big cities, some lines run so deep that data cuts out between stations. Load your route before you descend so you can follow your connection underground.
- Rural Hokkaido and the high Alps. Remote mountain roads, hiking trails and the far north can thin out. The Orange Travel eSIM helps here, leaning on whichever local network reaches furthest rather than locking you to one.
- Inside thick concrete buildings. The odd basement restaurant or older structure can swallow the signal, the same as anywhere.
None of these is a dealbreaker, but they are a reason to download offline maps for any rural day and to rely on an eSIM that connects to the strongest local network rather than betting on a single one.
A typical day of data use
To picture why 3 to 5 GB a week is realistic, here is a normal sightseeing day in Japan and what eats your data:
- Maps, all day. Walking and train navigation through unfamiliar districts is the single biggest drain.
- Translation. Pointing your camera at menus, signs and product labels, often dozens of times a day.
- Train apps. Checking platforms, transfers and the last train home in real time.
- Reviews and bookings. Looking up the next restaurant, reserving a museum slot, scanning opening hours.
- Photos and messages. Sharing the day with people back home over your messaging apps.
Stack those up and a busy day runs to several hundred megabytes without any video. That is exactly why running dry mid-trip is so disruptive, and why sizing your plan a little generously pays off.
Our recommendation
Whatever your profile, an eSIM is the right call: set it up at home, land connected, carry nothing, return nothing. Even for a group, two or three eSIMs cost less than a rented pocket Wi-Fi, with no battery to charge or device to return, and everyone keeps their own connection. A local prepaid SIM still exists as an option, but it makes you queue, swap a card, lose your usual number and stay tied to a single network.
The Orange Travel eSIM adds the decisive edge: thanks to roaming agreements with the Japanese operators, it connects to the local networks and leans on whichever one performs best, in the city or the mountains. The simplest version of the eSIM route is the eSIM for Japan: activated before departure, your usual number kept, the price known up front, connected the moment you land on the 4G/5G network, with the data options that suit your trip.
- An eSIM is simplest for solo travellers and couples: nothing to collect or return.
- Pocket Wi-Fi pays off only for groups sharing one connection.
- Do not rely on public Wi-Fi; it disappears the moment you step outside.
- Budget 3–5 GB a week; you will use more than you expect.
- Coverage is near-total; the Orange Travel eSIM leans on the strongest local network, so mountain travel needs no guesswork.
With Orange, the service trusted by more than 300 million customers, you travel with peace of mind: 200+ destinations covered, 24/7 human support, and a full refund if you never use your eSIM.
Ready to land in Japan already connected?
