If you're planning a trip to Japan, one of the first practical questions is how to get internet in Japan without a nasty surprise on your bill or ending up stranded in the middle of Shibuya trying to find your hotel. I've tried almost all the options, and the truth is some are much more worthwhile than others. In this guide, I compare all the ways tourists can get connected: roaming with your carrier, free Wi-Fi in hotels and konbinis, the famous Japanese pocket Wi-Fi, local SIM cards, and eSIMs. I'll tell you about 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 life, and returns.
That said, there isn't one 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 together and want to share one 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 roaming with your Spanish carrier as a last resort: it's the "do nothing" option, and precisely for that reason, 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 exactly when you need it. In the following sections, I break down each option with approximate figures so you can choose wisely and not out of inertia.
All options at a glance
Before going into detail, here's the complete overview. There are five realistic ways to get connected in Japan, and they don't all cost or weigh the same. This table summarizes the approximate price, convenience, and the "but" of each one, so you can quickly see the general idea before deciding.
| Option | Approximate Price | Convenience | Its big "but" |
|---|---|---|---|
| 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 phone |
As you can see, the price range is enormous: between paying €12/MB for pure roaming and paying from €12 for 5 GB for an eSIM, there's a world of difference. Convenience also matters: some options you set up from your couch at home, while others require you to queue at an airport counter in Narita. In the following sections, I'll go into each one with their 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 European Union's "roaming like home" zone, 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 bundles to gloss over 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 isn't bad for the price but is very limited in 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 bundle before you leave. If you want the detailed figures, you'll find useful information on how much international roaming costs and the comparison of eSIM vs. roaming, 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 works 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 primary 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 out into the street with you. There's an app called Japan Connected-free Wi-Fi, which aggregates several networks, though its coverage is patchy 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 supplement, 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 pocket-sized 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, and similar companies), 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 cost.
That's where the advantages end and the "buts" begin. First, it's another device to carry: the battery lasts a few hours, and if you forget to charge it 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 gets separated from the group, the others will be without data.
It's a solid option for family trips with a shared itinerary, but for solo travelers or couples, it's often more trouble than it's worth. Before booking it, check the comparison of eSIM vs. pocket Wi-Fi, because many of its advantages are already covered by an eSIM without carrying the device 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, it has an important nuance that catches many people by surprise: SIMs for tourists in Japan are data-only. To have a Japanese number with voice, you need to prove residency, so as a visitor, you can forget about calls with a local number and rely on data, WhatsApp, and messaging apps.
You can find them in vending machines and airport counters, in 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 drawback compared to eSIM is precisely that: you depend on finding the counter open, you manipulate a tiny card while jet-lagged, 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 eSIM vs. local SIM first to see if the hassle is really worth it for you.
eSIM: my recommended option
For the vast majority of travelers with a recent mobile phone, 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 switch it on when you land.
Travel eSIMs for Japan usually rely on Docomo or KDDI networks, which offer the best coverage in the country, so the signal quality is the same as what 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 month-long stays. 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 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 claim.
If this is your first eSIM, you might find it useful to read what an eSIM is and then the eSIM guide for Japan, where I explain activation step by step.
Pocket Wi-Fi vs. eSIM, head-to-head
Since pocket Wi-Fi and eSIM are the two options most people seriously consider, it's worth putting them head-to-head. Both give you a good connection with Japanese networks; the difference lies 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 phone's own battery |
| Pickup and return | Yes, at the airport or by mail | Nothing to return |
| Deposit | Common | None |
| Multiple devices | Ideal, share with the group | One per eSIM (or share data) |
| If you get separated from the group | Others lose data | Everyone has their own |
In translation: if four people are traveling with a shared itinerary all day, a pocket Wi-Fi can be cost-effective and sort you out with a single rental. But for solo travelers, couples, or those who want the freedom to split up without losing communication, an eSIM clearly wins. No device to carry, no deposit, and no anxiety about returning it before catching the return flight, which always ends up being rushed. In my experience, apart from the clear case of a family group, the balance tips 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: whether it's 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 effective 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, though 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 whatever you need. In rural areas—Japanese Alps villages, hiking trails, small islands—5G is scarce, but Docomo's 4G holds up almost everywhere. If you're going to move around a lot in the countryside, choose a plan that relies on Docomo's network and you'll travel with peace of mind.
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 by actual use and not out of fear. A tourist mainly uses maps, messaging, some social media, and real-time translation; it's better to do video and large downloads on the hotel's 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 scrolling) | ~150-300 MB/day |
| Translation and searches | ~30 MB/day |
| Uploading photos and some videos | ~200-400 MB/day |
Adding up normal use, it comes to about 400-800 MB per day. With that reference, 3-5 GB is enough for a week; for ten or fifteen days, a 10-20 GB plan will be more than enough; and if you're constantly uploading videos or tethering to your laptop, go straight for an unlimited data plan. My trick: calculate your gigabytes, round up with a small buffer, and download offline maps of your cities for the day the signal fails. That way you don't run short or pay too much for gigabytes you won't touch.
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 SMS and calls from the bank while data travels via 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 widely available in Tokyo, Osaka, and Kyoto and works great, but for maps, messaging, and social media, you won't notice it missing 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 plenty for a week. If you watch a lot of video or tether to your laptop, upgrade 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. Just be sure to turn off data roaming for your Spanish line to avoid paying extra without realizing it.
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, sessions expire, and it doesn't extend to the street with you. It's good as a backup, not as a primary 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) is close behind, and SoftBank excels in urban speeds. 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 one connection among several phones and is cost-effective. For solo travelers, couples, or those who want to separate without losing data, an eSIM is more convenient and doesn't involve a device to return.
Conclusión
Getting internet in Japan is easy; the hard part is not overpaying or dealing with unnecessary hassles. If your mobile supports eSIM, that's my clear recommendation: coverage from the best Japanese networks, a fair price, and no airport procedures. Pocket WiFi has its place for group trips, a local SIM is useful if your phone is old, free WiFi 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 as soon as you land. Once you've decided, take a look at the eSIM for Japan and travel worry-free from the very first minute.
