eSIM for Japan: how much data you need for a Tokyo trip

Tokyo is a city where you'll lean on your phone more than you expect. Train transfers, station exits, restaurant searches, translating menus — it all runs through maps and apps, and free Wi-Fi isn't something to count on once you leave your hotel. The good news is that a Japan eSIM is cheap, quick to set up, and works the moment you land. The only real question is how much data to buy.

The short answer

Most visitors to Tokyo use about 1 to 2 GB a day — a little more than the 0.5 to 1 GB we'd suggest for a typical trip elsewhere, because you'll be navigating trains and translating far more often. For a one- to two-week trip, a plan of 10 to 20 GB covers most people comfortably.

Plan size by trip length

Light use means maps, train apps, and messaging. Normal use adds translation, regular social media, and some music. Heavy use means video calls, streaming, or sharing your connection with a laptop or travel companion. For a fuller breakdown of how much each app uses, see our guide to how much eSIM data you actually need.

What uses data in Tokyo

• Maps and train routes: you'll use them constantly, but they use little data. This is the main reason to have a connection at all.
• Translation apps: camera translation of menus and signs uses more data than text translation. Downloading the Japanese language pack before you go reduces it a lot.
• Photos and video: posting or backing up to the cloud over mobile data adds up fast. Set uploads to Wi-Fi only.
• Video calls home: the biggest single drain. Calls over WhatsApp, FaceTime, or LINE all work normally in Japan.

"Unlimited" plans: read the fine print

Many Japan eSIMs advertised as unlimited slow your speed down after a daily amount, often around a few GB a day. That's plenty for most people, but if you need fast data all day — for remote work, for example — check the plan's daily limit before choosing it over a large fixed plan.

Before you buy: three things to check

• Your phone supports eSIM. Most phones from the last few years do. Our guide to how eSIMs work in different countries covers how to check.
• Your phone is unlocked. A phone locked to your home carrier won't accept another eSIM. Check this a few weeks before you travel so there's time to ask your carrier to unlock it.
• It's a data-only plan. Tourist eSIMs for Japan generally give you data but no Japanese phone number. That's fine for almost everything — you'll call and message through apps — but keep your home number active if you'll need texts from your bank.

When to install it

Install the eSIM at home over Wi-Fi a day or two before you fly, but leave it switched off. When you land, turn it on and turn on data roaming for that line — most plans start counting days from the moment they connect in Japan, not from the moment you install them. It's also worth screenshotting the QR code or setup details, in case you need to reinstall.

eSIM or pocket Wi-Fi?

Pocket Wi-Fi — a small rented router you carry with you — is still popular in Japan. It makes sense if you're traveling as a group and want one device to share, or if someone's phone doesn't support eSIM. For solo travelers and couples, an eSIM is usually cheaper and simpler: nothing to pick up or return, and no extra battery to charge every night.

Arriving soon?

If you haven't decided which airport to fly into, we've compared the two in Haneda vs Narita — Haneda is closer and faster for most visitors.

Related reading

The short version

Plan on 1 to 2 GB a day in Tokyo, which means about 10 GB for a week or 20 GB for two weeks with normal use. Check that your phone supports eSIM and is unlocked, install the plan before you fly, and switch it on when you land. You'll have maps, trains, and translation working before you've left the airport.