If you're planning a trip to Japan, one of the first practical questions that comes to mind is how to get internet in Japan without a shocking bill or ending up stranded in the middle of Shibuya trying to find your hotel. I've tried almost every option, and honestly, some are much better than others. In this guide, I compare all the ways to connect as a tourist: your carrier's roaming, free hotel and convenience store Wi-Fi, the famous Japanese pocket Wi-Fi, local SIM cards, and eSIMs. I'll tell you about the coverage in Tokyo, Osaka, Kyoto, and rural areas, which networks you'll use, and how much data you really need.
Internet in Japan: The quick answer
For most tourists, an eSIM is the best way to get internet in Japan: it installs in minutes, uses local Docomo or KDDI networks, and is cheaper than roaming. Pocket Wi-Fi is still very popular, but it involves carrying a device, battery, and returning it.
That said, there's no single answer for everyone, because it depends on your phone and how many days you're traveling. If your phone supports eSIM (most iPhones since the XS in 2018 and many recent Androids), that's the most convenient route. If several people are traveling and want to share a single connection, pocket Wi-Fi makes sense. And if your phone is old and doesn't support eSIM, you're left with a physical SIM or pocket Wi-Fi.
I almost always leave your Spanish carrier's roaming as a last resort: it's the "do nothing" option, and precisely because of that, it's the most expensive. Free Wi-Fi is fine as occasional support, but don't rely on it as your main plan if you don't want to depend on finding a signal just when you need it. In the following sections, I break down each option with approximate numbers so you can choose wisely and not by inertia.
All options at a glance
Before going into detail, here's the complete map. There are five realistic ways to connect in Japan, and not all of them cost or weigh the same. This table summarizes the approximate price, convenience, and the "catch" of each one, so you can see at a glance what to expect before deciding.
| Option | Approximate price | Convenience | Its big "catch" |
|---|---|---|---|
| Carrier roaming | €10-15/day or ~€12/MB | Zero setup | Very expensive and limited data |
| Free Wi-Fi | Free | Low, you have to look for it | Intermittent and requires registration |
| Pocket Wi-Fi | €5-9/day + deposit | Medium | Device, battery, and return |
| Local SIM (data-only) | €15-30 per trip | Medium | Process and changing cards |
| eSIM | From ~€12 / 5 GB | High | Requires compatible mobile phone |
As you can see, the price range is enormous: between paying €12/MB for pure roaming and paying from €12 for 5 GB with an eSIM, there's a world of difference. Convenience also matters: some options you can set up from your couch at home, while others require you to queue at a counter at Narita Airport. In the following sections, I'll go into each one with its real advantages and fine print, so that the table stops being a summary and becomes a clear decision based on your specific case.
Roaming with your Spanish carrier
Roaming is the most convenient option to start with, and almost always the most expensive. Japan is outside the "roaming like at home" zone of the European Union, so European rates don't apply here: you enter an international zone where the bill skyrockets without warning. With Movistar, for example, pay-as-you-go costs around €12/MB, a figure that turns any video into an absurd luxury.
Carriers know this and offer daily bonuses to sugarcoat it. Vodafone, with its service for traveling outside Europe, charges around €15/day for about 2 GB daily; Orange has packages like 100 MB for €7/day, which is not bad for the price but too little for the volume. Do the math: two weeks at €10-15 a day is €140-210 just for data, and often with limits that don't cover normal use with maps and photos.
My advice: use roaming only as an emergency backup and check your allowance before you leave. If you want the detailed numbers, you might find how much international roaming costs and the comparison of eSIM vs. roaming useful, where you'll see the real difference in euros.
Free Wi-Fi: hotel, konbini, and stations
Japan has a reputation for being a hyper-connected country, and in part it's true: there's free Wi-Fi in many places. The problem is that, as a sole plan, it falls short. The Wi-Fi that does work well is in accommodation: almost all hotels and ryokans offer a decent connection in the room, ideal for planning the next day's route or making video calls at night. Outside of that, things get complicated, and it serves as support, not as a main plan.
Konbinis (7-Eleven, FamilyMart, Lawson) have free Wi-Fi, as do many train stations, airports, and cafes. It sounds great, but in practice, it usually requires registration, the session expires every 30-60 minutes, and the signal doesn't go with you outside. There's the app Japan Connected-free Wi-Fi, which groups several networks, although its coverage is spotty and it doesn't always connect on the first try.
The honest conclusion: free Wi-Fi is good for saving data at the hotel or downloading offline maps, but relying on it to get around, order a taxi, or translate a menu in real time is a source of stress. Just when you need it most—lost in a huge station—is when there's no signal or registration fails. Use it as a complement, not as the backbone of your connection.
Pocket Wi-Fi: The king in Japan (and its cons)
Pocket Wi-Fi is an institution in Japan. It's a portable router that connects to the local mobile network and shares Wi-Fi with several devices at once. You rent it by the day (Ninja WiFi, Japan Wireless, etc.), pick it up at the airport or have it sent to your hotel, and it usually costs €5-9/day plus a deposit. For groups or families, it's very attractive because a single connection can serve several phones without multiplying the expense.
That's where the advantages end and the "buts" begin. First, it's one more device to carry: the battery lasts a few hours, and if you forget to plug it in at night, you'll be without internet by mid-morning. Second, you absolutely have to return it; if you lose or damage it, you pay the full deposit. Third, everyone depends on the same device: if the person carrying it separates from the group, the others will lose data.
It's a solid option for family trips with a shared itinerary, but for those traveling alone or as a couple, it's usually more hassle than it's worth. Before booking, check the comparison of eSIM versus pocket Wi-Fi, because many of its advantages are already covered by an eSIM without the burden of carrying the gadget or worrying about returns.
Local Japanese SIM (data-only)
Buying a Japanese SIM upon arrival is the classic option, and it's still valid, especially if your phone doesn't support eSIM. However, there's an important detail that surprises many people: tourist SIMs in Japan are data-only. To have a Japanese number with voice, you need proof of residency, so as a visitor, you won't have local call capabilities and will rely on data, WhatsApp, and messaging apps.
You can find them in vending machines and airport counters, at electronics stores like Bic Camera or Yodobashi, and from brands like IIJmio, Mobal, or b-mobile. Prices are around €15-30 depending on the days and gigabytes. The process is simple but it exists: show your passport, choose a plan, and physically swap your card for the Japanese one, keeping yours safe so you don't lose it.
The disadvantage compared to an eSIM is precisely that: you depend on finding an open counter, you handle a tiny card with jet lag, and if you only have one SIM slot, you lose your Spanish line while using the Japanese one. If you're interested in this route, compare it first in eSIM vs. local SIM to see if the process is really worth it for you.
eSIM: The option I recommend
For the vast majority of travelers with a phone from the last few years, an eSIM is the cleanest way to connect. It's a digital SIM that already lives inside your phone: you buy the Japan plan, receive a QR code, and activate it via software. No waiting for shipments, searching for counters, or carrying devices. You can get it ready from home in five minutes using your Wi-Fi and turn it on when you land.
Travel eSIMs for Japan usually rely on Docomo or KDDI networks, which have the best coverage in the country, so the signal quality is the same as a local would get. Prices are very competitive: from ~€12 for 5 GB, around €25-35 for 20-50 GB, and unlimited data plans around €45 for stays of one month. Plus, thanks to Dual SIM, you keep your Spanish number active for bank SMS while data runs on the eSIM.
What I value most: I install it on my couch at home the day before flying, and when I get off the plane in Narita, I activate the data and I'm already asking for directions on the map. Zero queues, zero tiny cards, zero deposits to reclaim.
If it's your first eSIM, you might find it useful to read what an eSIM is and then the eSIM guide for Japan, where I explain the activation step by step.
Pocket Wi-Fi vs. eSIM, face to face
Since pocket Wi-Fi and eSIM are the two options most people actually consider, it's worth putting them head-to-head. Both give you a good connection with Japanese networks; the difference is in daily convenience and logistical hassle. This table makes it clear point by point.
| Aspect | Pocket Wi-Fi | eSIM |
|---|---|---|
| What you carry | An extra router to charge | Nothing, it's in your phone |
| Battery | Depends on charging it every night | Your own phone's battery |
| Pickup and return | Yes, at the airport or by mail | Nothing to return |
| Deposit | Common | None |
| Multiple devices | Ideal, shares with the group | One per eSIM (or data sharing) |
| If you separate from the group | Others lose data | Everyone has their own |
In other words: if four people are traveling with a tight, all-day itinerary, a pocket Wi-Fi can be worthwhile and cover everyone with a single rental. But for those traveling alone, as a couple, or wanting the freedom to separate without losing communication, an eSIM clearly wins. No device to carry, no deposit, and no anxiety about returning it before catching your flight home, which always ends up being rushed. In my experience, unless it's a clear case of a family group, the scales tip in favor of the eSIM.
4G and 5G coverage and Japanese networks
Here's some good news: Japan is one of the most connected countries in the world, so coverage won't be your problem. The important thing is to understand that the network matters more than the format you choose: it doesn't matter if it's an eSIM, SIM, or pocket Wi-Fi, what matters is which Japanese operator you connect to. There are three major ones—NTT Docomo, au (KDDI), and SoftBank—plus Rakuten Mobile, which is newer and less robust outside cities.
NTT Docomo is the king of coverage: it reaches 99.9% of the territory in 4G and is the most reliable in rural and mountainous areas thanks to its low-band antennas. That's why most travel eSIMs use its network or KDDI's. For 5G, cities are well covered: in Tokyo, Docomo covers about 96% of the 23 districts, and in Osaka, it's around 91%. SoftBank offers the highest average speeds in dense urban areas, although it's a bit weaker in deep rural areas.
In practice: in Tokyo, Osaka, and Kyoto, you'll have plenty of 4G and 5G for what you need. In rural areas—Japanese Alps towns, hiking trails, small islands—5G is scarce, but Docomo's 4G holds up almost everywhere. If you're going to travel a lot in the countryside, choose a plan that relies on the Docomo network and you'll travel worry-free.
How much data you need in Japan
The million-dollar question before buying any plan. The short answer is less than you think, but it's good to calculate by days and real usage, not by fear. A tourist primarily uses maps, messaging, some social media, and real-time translation; it's best to do video and large downloads on hotel Wi-Fi. This table gives you a reference by daily activity.
| Daily activity | Approximate consumption |
|---|---|
| Google Maps and navigation | ~50-100 MB/day |
| WhatsApp and messaging | ~20-50 MB/day |
| Social media (normal scroll) | ~150-300 MB/day |
| Translation and searches | ~30 MB/day |
| Uploading photos and some video | ~200-400 MB/day |
Summing up normal usage, it comes to about 400-800 MB per day. With that reference, for a week, 3-5 GB is enough; for ten to fifteen days, a 10-20 GB plan is more than enough; and if you're constantly uploading videos or tethering to a laptop, go straight for an unlimited data plan. My trick: calculate your gigabytes, round up with a small cushion, and download offline maps of your cities for the day the signal fails. This way, you won't run out or pay extra for gigabytes you won't use.
Frequently asked questions
Does WhatsApp work with an eSIM in Japan?
Yes, perfectly. WhatsApp uses data, not the voice network, so it works the same with a Japanese eSIM. Plus, with Dual SIM, your Spanish number remains active for receiving bank SMS and calls while data travels over the eSIM.
Do I need 5G to get good service in Japan?
No. Japan's 4G is very fast and covers almost the entire country, including rural areas. 5G is widespread in Tokyo, Osaka, and Kyoto and works great, but for maps, messaging, and social media, you won't notice its absence outside major cities.
How many GB do I need for a week in Japan?
For normal tourist use—maps, messaging, some social media, and photos—3-5 GB is more than enough for a week. If you watch a lot of video or tether to your laptop, go up to 10 GB or choose an unlimited plan and travel without worrying about the meter.
Can I keep my Spanish number in Japan?
Yes, if your phone supports Dual SIM. The eSIM carries your travel data and your Spanish SIM remains active for SMS and calls. However, turn off data roaming on your Spanish line to avoid unknowingly paying extra.
Is there free Wi-Fi all over Japan?
There's quite a lot, but it's inconsistent. Hotels, konbinis, stations, and airports offer free Wi-Fi, though it usually requires registration, the session expires, and it doesn't go with you outside. It's good as support, not as a main plan for moving around easily.
Which network is best in Japan: Docomo, au, or SoftBank?
For general coverage, NTT Docomo, which reaches 99.9% of the territory and dominates in rural areas. au (KDDI) follows closely, and SoftBank excels in urban speed. Most travel eSIMs use Docomo or KDDI, so you'll be well covered.
Pocket Wi-Fi or eSIM for family travel?
It depends on the group. For a family with a shared itinerary, pocket Wi-Fi shares a connection among several phones and is cost-effective. For those traveling alone, as a couple, or wanting to separate without losing data, an eSIM is more convenient and has no device to return.
Conclusion
Getting internet in Japan is easy; the hard part is not overpaying or dealing with unnecessary hassles. If your phone supports eSIM, that's my clear recommendation: coverage from the best Japanese networks, a fair price, and zero airport procedures. Pocket Wi-Fi has its place for group trips, local SIMs are useful if your phone is old, free Wi-Fi is a good backup, and roaming is best for emergencies only. Whatever you choose, get it ready before you take off and you'll be connected from the moment you land. Once you've decided, take a look at the eSIM for Japan and travel worry-free from the first minute.
