For most tourists, the most convenient way to get internet in Japan is a prepaid travel eSIM installed before the flight, so the phone connects as soon as it lands at Narita, Haneda or Kansai. The alternatives are roaming on your home plan, a SIM card from an airport counter, a rented pocket Wi-Fi router and free public Wi-Fi, and each one suits a different kind of trip. This guide compares all five, explains what you will actually use data for, and points to our Japan travel eSIM plans if you want it sorted today.
The five ways to get online in Japan
Every visitor ends up with one of these options, or a mix of two.
| Option | How you get it | Suits | Watch out for |
|---|---|---|---|
| Roaming on your home plan | Switch on data roaming when you land | Very short trips, or travellers whose plan already includes Japan | Usually a fee for every day away, often with a daily data cap |
| Airport SIM card | Counter or vending machine in the arrivals hall | Phones without eSIM support | Queues after a long flight, and your home SIM usually has to come out |
| Pocket Wi-Fi rental | Reserve online, collect at the airport or your hotel | Families and groups with several devices | One more gadget to charge, carry and return |
| Free public Wi-Fi | Airports, larger stations, cafes, convenience stores, hotels | A backup, or big downloads at the hotel | Sign-up screens, and no signal while you are walking or on a train |
| Travel eSIM | Buy online, scan a QR code at home | Most travellers with an unlocked, eSIM-compatible phone | Usually data only, with no Japanese phone number |
Each option in more detail
Roaming on your home plan
Roaming means your usual carrier lets your phone use a Japanese network. There is nothing to set up beyond switching data roaming on. The catch is the price. Roaming is usually charged as a fee for every day you are away, so the cost grows with the length of the trip, and the data often comes with a daily cap or reduced speeds. Check your carrier's Japan rates before you leave. If you decide not to use it, keep data roaming switched off for your home SIM so that background apps do not trigger a charge.
A SIM card from the airport
The arrivals halls of the main international airports have counters and vending machines selling prepaid SIM cards for visitors. Most of these are data only. You need an unlocked phone, and unless your phone has a spare SIM slot you have to take out your home SIM, which means missing calls and bank verification texts sent to your usual number. It also means finding the counter and working through the setup after a long flight. A physical SIM is still a sensible choice if your phone does not support eSIM.
Pocket Wi-Fi rental
A pocket Wi-Fi is a small battery-powered router that creates a private Wi-Fi network for several devices at once. You normally reserve one online, collect it at the airport or have it sent to your accommodation, and return it before you fly home. It works well for a family or a group with several devices. The downsides are practical: the router has to be collected, kept charged, carried all day and returned before your flight, and everyone has to stay within range of whoever is holding it.
Free public Wi-Fi
Free Wi-Fi is easy to find in airports, larger stations, many cafes and convenience stores, and most hotels. It is useful for uploading photos in the evening, but it is not a substitute for mobile data. Public Wi-Fi in Japan often needs a sign-up step and drops out between stations and shops, which is exactly when you want to check a route.
A travel eSIM
An eSIM is a digital SIM profile that you download by scanning a QR code. You buy it online, receive the code by email and install it at home on Wi-Fi, so you land already connected. Your home SIM stays in the phone for calls and verification codes while the eSIM handles data. You need a carrier-unlocked, eSIM-compatible phone, which includes iPhone XS and newer, Google Pixel 3 and newer, and Samsung Galaxy S20 and newer.
Our own Japan eSIM runs on the IIJmio network with 5G/4G data, hotspot included and no ID registration, from 5GB for 3 days at A$7.90 up to 50GB for 30 days at A$59.90. Prices are in Australian dollars and convert automatically at checkout if you shop in another currency. Like most travel eSIMs it is data only, so it does not come with a Japanese phone number. If you would like help comparing plans, read our guide to choosing an eSIM for Japan.
What you will use mobile data for in Japan
Maps and train navigation
This is the big one. Japan's rail network is superb and also complicated, with several railway companies sharing the same city and large stations spread over multiple levels. Google Maps and similar apps show platform numbers, train car positions and exit numbers, which saves a lot of time in hubs like Shinjuku, Tokyo and Umeda. Navigation is light on data, but it needs a connection that works while you are moving.
Translation
Signs in the major cities usually include English, but menus, ticket machines and notices outside the main tourist areas often do not. Camera translation, where you point the phone at printed text, handles most of these situations. Download the Japanese language pack on Wi-Fi so that it also works offline.
Restaurant bookings and queues
Popular restaurants often take reservations online, and some restaurants and guesthouses take bookings through LINE, the messaging app most people in Japan use. Being online also lets you check opening hours and find a nearby alternative when a place is full.
IC cards and payment apps
Suica and PASMO are rechargeable IC cards used on trains, subways and buses, and in many convenience stores and vending machines. They can be added to a compatible phone wallet and topped up with a data connection, so you can tap through ticket gates without queuing at a machine. Cards and phone payments are widely accepted in cities, but small restaurants, rural inns, temples and shrines often still prefer yen, so carry some cash as well.
How much data does a trip to Japan need?
Less than most people expect, unless you stream video or tether a laptop. As a working figure, heavy use of maps, translation and social apps averages roughly 1GB a day. Messaging and navigation use very little, while video and laptop tethering use the most. Matching that to our Japan eSIM plans:
- A long weekend in one city: 5GB for 3 days at A$7.90 covers maps, train times, translation and social media.
- About a week: 5GB for 7 days is A$9.90, and 10GB for 7 days is A$13.90 if you want room for photo uploads and the odd video call home.
- One to two weeks on the Tokyo, Kyoto, Osaka route: 20GB for 15 days at A$24.90 fits most trips of this length. Lighter users can take 10GB for 15 days at A$15.90.
- A month, remote work or sharing data: 30GB for 30 days is A$39.90 and 50GB for 30 days is A$59.90.
On these plans you are not cut off when the full-speed allowance runs out. Data continues at 256 kbps until the plan ends, which is enough for messaging and basic maps but not for video. If Japan is one stop on a longer journey, the Asia Explorer eSIM covers Japan and 11 more destinations on a single plan, and you can browse the wider range of Asia eSIM plans for other stops.
When to set everything up
Whichever option you choose, the airport arrivals hall is the worst place to start thinking about it. A simple timeline for an eSIM looks like this:
- A week or two before: confirm that your phone is carrier-unlocked and supports eSIM. Dial *#06#, and if a 32-digit EID number appears, your phone supports eSIM.
- At least a day before you fly: buy the plan. Our QR codes are emailed after purchase, usually within minutes, but orders placed after 1 AM AEST are sent from 9 AM AEST onwards.
- At home, on Wi-Fi: scan the QR code in your phone's mobile settings. Installing the Japan eSIM early does not start the plan. It must be installed and used within 60 days of purchase.
- When you land: switch on the eSIM line, set it as your mobile data line and turn on data roaming for that line. The 3, 7, 15 or 30 days are counted from the first network connection in Japan.
Practical setup tips
- Download offline maps. Signal thins out on remote hiking trails, in deep valleys and on small outlying islands, so save the area before a day in the Japan Alps or on the Kumano Kodo.
- Keep your home SIM active for texts. Leave it switched on for calls and bank codes, with its data roaming turned off, and use the eSIM for data.
- Pause updates while tethering. Hotspot is supported on every one of our Japan eSIM plans and uses your allowance. Laptop updates and cloud backups burn through data quickly.
- Know where to get help. Our Melbourne-based support team is available 16 hours a day by live chat and email if an installation does not go to plan.
Ready to choose? Compare data sizes and trip lengths on our eSIM for Japan page, or read how to choose a Japan eSIM for a plan-by-plan breakdown.
Frequently asked questions
Do I need mobile internet in Japan, or is free Wi-Fi enough?
Free Wi-Fi is fine as a backup, but it is not enough on its own for most trips. It often needs a sign-up step and it drops out between stations and shops, which is when you need maps and train times. Mobile data from an eSIM, a SIM card, a pocket Wi-Fi or roaming is more dependable on the move.
Can I buy a SIM card at the airport in Japan?
Yes. The main international airports have counters and vending machines selling prepaid visitor SIM cards, most of them data only. You need an unlocked phone, and you will usually have to remove your home SIM to use one. A travel eSIM avoids the queue because it is installed before you fly.
Is pocket Wi-Fi or an eSIM better for Japan?
It depends on who is travelling. A pocket Wi-Fi suits a group sharing one connection across several devices, or phones that do not support eSIM. An eSIM suits solo travellers and couples with compatible phones, because there is nothing to collect, charge or return, and our Japan eSIM plans include hotspot if you need to share.
Will my phone work in Japan?
Most recent smartphones work in Japan as long as they are carrier-unlocked. For an eSIM, the phone also needs eSIM support, which includes iPhone XS and newer, Google Pixel 3 and newer, and Samsung Galaxy S20 and newer. Dial *#06# to check: if a 32-digit EID number appears, your phone supports eSIM.
How much data do I need for a week in Japan?
Heavy use of maps, translation and social apps averages roughly 1GB a day. For a week, our Japan eSIM offers 5GB for 7 days at A$9.90 for lighter use, or 10GB for 7 days at A$13.90 if you upload photos and make video calls. Choose a larger plan if you stream video or tether a laptop.
Can I make phone calls with a travel eSIM in Japan?
Our Japan eSIM is data only, with no phone number and no SMS. Use LINE, WhatsApp, FaceTime or another internet calling app over data. Your home SIM can stay in the phone, so you still receive calls and texts on your usual number.
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