# eSIM, pocket Wi-Fi or SIM card for Japan: what to get

The best eSIM, pocket Wi-Fi or SIM card for Japan depends on one question first: do you only need data, or do you also need a Japanese phone number? For most visitors a data-only eSIM set up before the flight is the simplest answer, and a pocket Wi-Fi still makes sense for groups and laptops. This page compares the options with rough costs as of 2026, explains the phone-number problem with Japanese ticket sites, and covers the ID rules that are changing.

## Data only or a Japanese number: the real decision

Almost all tourist eSIMs and SIM cards are data-only. You get fast internet but no Japanese phone number, so you cannot make ordinary calls or receive texts on a Japanese number. For maps, translation, LINE, WhatsApp, ride apps and hotel bookings that is all you need, and it is what most visitors should buy.

The number matters in a few places. Japanese ticket sites such as e+, Ticket Pia and Lawson Ticket often verify your account by SMS, and they work best with a Japanese mobile number starting 070, 080 or 090; foreign numbers and 050 internet numbers are often refused. A few specialist providers sell visitor plans with a real Japanese number, voice and SMS. They cost more and ask for ID checks with your passport, so buy one only if you know you need it.

Most recent phones hold two lines at once, which solves a lot. Keep your home SIM switched on for calls, bank codes and messages from home, use the eSIM for data, and turn data roaming off on the home line so it does not run up charges. If you live in Japan, the answer is a normal contract with your residence card: since April 2026 online contracts for lines with a phone number require the ID card's IC chip to be read.

- Read the plan name: data only, or voice and SMS. Unlimited plans often slow down after a daily allowance, so check the fair-use line.
- A data-only line has no number. To call a restaurant or a hotel, use your home line on roaming or an internet call app.
- Planning to buy concert tickets on Japanese sites? Sort out SMS before you fly.

- → [How to buy event tickets in Japan](https://eventstokyo.com/en/guides/tickets.md)
- → [Concerts in Tokyo](https://eventstokyo.com/en/guides/concerts.md)

## eSIM: check your phone, then set it up at home

Two things decide whether a travel eSIM will work: the phone must support eSIM, and it must be unlocked (not tied to your carrier). iPhone XS, XR and later support eSIM, as do most recent Pixel and Galaxy phones. Phones sold in mainland China are the main exception: Apple lists only a few recent iPhone models with eSIM there, and some Hong Kong and Macao models use two physical SIM slots instead. On an iPhone, Settings, General, About shows Carrier Lock: No SIM restrictions when the phone is unlocked, and the Mobile Data menu has an Add eSIM option when eSIM is supported.

Buy the eSIM online, then install it at home on Wi-Fi a day or two before the flight, by QR code or through the seller's app. Leave it switched off until you land. In Japan, turn the eSIM line on, set it as the line for mobile data and allow data roaming for that line (travel eSIMs connect as roaming lines, which is normal). Many plans start counting days at the first connection in Japan rather than at installation, but check your plan's terms.

- Do not delete the eSIM during the trip. Many can be installed only once.
- Screenshot the installation details and the seller's support contact before you leave home.
- The listing usually names the Japanese network it uses: Docomo, au (KDDI) or SoftBank all cover Tokyo well.

## Pocket Wi-Fi: when it still makes sense

A pocket Wi-Fi is a small battery router that makes a hotspot for several phones and laptops. It is the better pick for a family or group sharing one connection, for phones that are locked or have no eSIM, and for anyone working on a laptop all day. The downsides: one more device to charge (many last around 8 to 10 hours), the group has to stay together to share it, and losing it costs a fee.

Book online before the trip and choose where to collect it. At [Narita](https://www.narita-airport.jp/en/service/internet/) every terminal has rental and SIM counters, and at [Haneda](https://tokyo-haneda.com/en/service/facilities/cellular_phone_rental.html), where most international flights use [Terminal 3](https://www.google.com/maps/search/?api=1&query=%E7%BE%BD%E7%94%B0%E7%A9%BA%E6%B8%AF%E7%AC%AC3%E3%82%BF%E3%83%BC%E3%83%9F%E3%83%8A%E3%83%AB%20%E6%9D%B1%E4%BA%AC%E9%83%BD%E5%A4%A7%E7%94%B0%E5%8C%BA%E7%BE%BD%E7%94%B0%E7%A9%BA%E6%B8%AF2-6-5), the counters are in its 2F arrival lobby and one shop also runs a 24-hour unmanned pickup. Many companies will also deliver the router to your hotel. Returning is usually done at an airport counter or by dropping it in a post box in the prepaid envelope that comes with it.

- Carry a power bank if you will be out from morning to night.
- Before you leave the counter, ask exactly how and by when to return the router.
- Haneda's Terminal 1 and 2 also have vending machines selling prepaid data SIM cards.

- → [How to get from Narita and Haneda to central Tokyo](https://eventstokyo.com/en/guides/airport.md)

## Free Wi-Fi and roaming: what you can rely on

Free Wi-Fi in Tokyo works well at airports, big stations, department stores, chain cafes and hotels, and much less well on the street and on trains, where you also have to log in again and again. It has become thinner in places visitors used to count on: 7-Eleven and FamilyMart ended their free in-store Wi-Fi in 2022, and Tokyo Metro's station Wi-Fi is currently suspended for equipment upgrades. The Tokyo government's own network, TOKYO FREE Wi-Fi, is being moved to OpenRoaming at hundreds of public facilities, so after one registration your phone connects by itself. Treat all of it as a backup, not as the way you find your way around.

Roaming with your home carrier needs no setup and keeps your number, and many carriers sell a daily pass for Japan. It is often the easiest choice for a short business trip. For a week or more, a travel eSIM usually costs much less, so check your carrier's daily price for Japan and multiply it by your days before deciding.

- Check the network name before you connect, and avoid online banking on open networks.
- Download offline maps of Tokyo before the flight, in case your data takes a while to start.

## Rough costs and the rules that are changing

As rough guides as of 2026: a travel eSIM with unlimited data costs a few thousand yen for a week from the large online sellers (around ¥4,000 to ¥5,000 at one of the biggest), and plans with a fixed amount of data cost less. Pocket Wi-Fi rentals start at a few hundred yen a day, and unlimited routers from the main rental firms often cost around $5 a day, with extras for insurance, power banks or delivery. Visitor plans with a Japanese number cost the most, often with a one-off activation fee on top. Roaming passes depend entirely on your carrier.

Japan's ID rules for phone lines are getting stricter, according to the [Ministry of Internal Affairs and Communications](https://www.soumu.go.jp/tokushusagi/id-check/). Since April 2026, online contracts for voice lines require the ID's IC chip to be read. From April 2027, data-only SIM and eSIM contracts also come under ID checks, and the ministry says short-term foreign visitors using data SIMs for tourism or business can be included. In practice, expect a passport step when you buy, and buy from a known seller rather than a reseller with no support.

- Compare: eSIM price for your dates against your carrier's daily pass times the number of days.
- Count the people: one router for four people can cost less than four eSIMs.

- → [First time in Tokyo: what to know before you go](https://eventstokyo.com/en/guides/first-time.md)
- → [Money in Tokyo: cash, cards, IC cards and ATMs](https://eventstokyo.com/en/guides/money.md)

## Questions people ask

**What is the best eSIM for Japan?**
Any well-reviewed data-only eSIM that runs on Docomo, au (KDDI) or SoftBank works well in Tokyo. Choose by data amount, number of days, the fair-use limit on unlimited plans and how easy support is to reach, and install it before you fly.

**Do I need a Japanese phone number in Tokyo?**
Not for maps, messaging, payments or most bookings. You need one mainly for Japanese ticket sites and a few services that verify by SMS. Keep your home SIM on for texts, or buy a visitor plan with a Japanese number if tickets are the point of the trip.

**Is an eSIM or a pocket Wi-Fi better for Japan?**
An eSIM is simpler for one or two people with compatible, unlocked phones. A pocket Wi-Fi is better for groups that stay together, for laptops and for phones without eSIM.

**Can I buy a SIM card or pocket Wi-Fi at Narita or Haneda?**
Yes. Both airports have rental and SIM counters in or near the arrival lobbies, and Haneda has SIM vending machines in Terminals 1 and 2. Booking a router online in advance and collecting it at the counter is the usual way.

**Is there free Wi-Fi in Tokyo?**
At airports, large stations, department stores, chain cafes and hotels, yes. On the street and on trains it is patchy and needs repeated logins, so it works as a backup, not as your main connection.

**Does my phone need to be unlocked to use a Japanese eSIM?**
Yes. A phone locked to your home carrier will not accept another eSIM or SIM. Roaming with your home carrier works without unlocking, but costs more for longer stays.

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Tokyo Events: https://eventstokyo.com/en/guides/esim-wifi