Staying connected in Japan: eSIM, pocket WiFi, or a SIM card?

You've just landed. You're standing in the station with your suitcase, three exits in front of you, and no idea which one your hotel is behind. You open the maps app — and it just spins.

This is the part of a Japan trip people forget to plan. Flights, hotels, the rail pass — all sorted months ahead. How you'll actually get online, the thing you'll reach for a hundred times a day? An afterthought at the airport. So let's sort it now.

Don't count on the free WiFi

Here's the honest bit first, because it saves people a lot of grief. Japan does have free public WiFi — at the airports, at big JR and shinkansen stations, in Lawson convenience stores, in some cafes. It's real, and it's fine for a quick message.

But it won't carry your trip. The hotspots are scattered, often slow, and many make you register through a fiddly, half-Japanese sign-in each time. Worst of all, the connection dies the second you walk out the door — which is exactly the moment you need the map, the train time, or the translation. Lawson, for instance, gives you five sixty-minute sessions a day, and that's genuinely one of the better ones. Nice as a backup. Not a plan.

So you'll want your own connection. There are three ways to get one.

The three ways to get online

An eSIM is the easy answer for most people now. It's a digital SIM you buy online and load onto your phone — no plastic, no queue at the airport. For a solo traveller or a couple with a fairly recent, unlocked phone, it's usually the cheapest and simplest route. A quiet bonus: you can leave your home SIM switched on for texts and calls to your normal number while the eSIM handles the data.

A pocket WiFi is a little rental router you carry with you. It shines for families and groups, because one device puts several phones, tablets and laptops online at once. It also rescues anyone whose phone is locked to their home carrier or too old for an eSIM. The trade-off is one more gadget to charge and hand back — you pick it up at an airport counter and drop it in a return envelope at the end.

A physical SIM card is the old-fashioned swap: pop out your home SIM, pop in a Japanese one. It works well, but your phone has to be unlocked, and you'll lose your usual number while it's in. If you land with nothing arranged, the konbini can save you — Lawson, FamilyMart and 7-Eleven sell basic tourist SIMs around the clock.

The three things that trip people up

Most tourist eSIMs and SIMs are data-only. That means no Japanese phone number for regular calls — which is fine, because everyone here reaches each other on LINE anyway, and that runs on data.

Your phone has to be unlocked to take a Japanese SIM or eSIM. If you're not sure, ask your carrier before you fly. If it's locked, pocket WiFi is your friend.

And with an eSIM, download it before you leave home, on your own WiFi — but know that the clock usually starts when you activate it, so switch it on when you land in Japan, not the week before.

That's really all there is to it. Get this one small thing sorted before you fly, and Japan opens up: the maps work, the trains make sense, the odd little restaurant you found online is suddenly findable. If you're still piecing the practical stuff together, our guide to Japan's IC transit cards and how much cash to actually bring are the natural next reads.

See you online — and out there.