Japan eSIM for 60–90 Days: Stack Plans Without Gaps

You're coming for two or three months, and every Japan eSIM guide you open is written for someone here for ten days. Here's the short version: almost no travel eSIM covers 90 days in one purchase, so you'll either buy one of the rare long-duration plans, stack three 30-day plans back to back, or start with an eSIM and move to a Japanese monthly plan once you have a residence card.

Which one is right for you comes down to a single question, and it isn't about price. It's whether you're getting a residence card.

Let's sort that out first, then the money, then the exact steps so you never lose signal on switch-over day.

📶 Why almost everything stops at 30 days

Travel data plans are built around the average holiday, and the average holiday is under two weeks. So sellers set their validity windows — the number of days your plan stays alive — at 30 days and stop there.

You can see it on the official pages. Japan Wireless tops out at 30 days across every plan type, unlimited or capped. Ubigi's Japan plans run to 30 days. IIJmio's prepaid travel SIM offers 10, 15 or 31 days on unlimited, and a fixed 30-day window on its 3 GB–55 GB tiers.

Here's the giveaway, though. Sakura Mobile does sell a 93-day SIM card — and their own price page says it arrives as three 30-day cards in one package, with ¥3,000 off (as of 2026-09). Their 62-day product is two 30-day cards, ¥2,000 off.

So stacking isn't a workaround you invented. It's how the industry actually delivers a long stay.

🪪 The residence card question

If you're on a working holiday, a student visa, or any status that lets you stay more than three months, you're a "mid- to long-term resident" and you get a residence card. JETRO's official guide confirms the card is not issued for stays of three months or less, and not to anyone on Temporary Visitor status. You register your address at the city office within 14 days of moving in.

If you're a tourist on a 90-day stay, you will not get one. That closes the door on most Japanese monthly plans, and it's the fork in the road for this whole article.

One exception worth knowing: Mobal states on its own site that overseas customers do not need a residence card — ID verification instead — and it still gives you a real Japanese 070/080/090 number rather than a virtual one.

Do expect the ID check to be stricter than it used to be. KDDI's povo published a notice that from 25 March 2026 the old "photograph your document and take a selfie" method was discontinued for new voice contracts, replaced by scanning the IC chip in a My Number card, driver's licence or residence card. In plain words: expect to hold your card flat against the back of your phone, not just take a picture of it.

💸 What 90 days actually costs

Three routes, priced from the sellers' own pages as of 2026-09. Note that the travel eSIM sellers quote in US dollars and the Japanese providers quote in yen — compare them at whatever the rate is on the day you buy.

The pattern is clear. If you want a lot of data, a Japanese monthly plan wins on cost per GB by a wide margin — the one-off setup fee spreads thin over three months. If you want unlimited and zero paperwork, you pay roughly double for the privilege.

Two footnotes on that table. Sakura Mobile lists a student discount of ¥1,100 off the activation fee with a coupon code. And Mobal says unused data rolls over to the next month, which matters if your first month is quiet and your third is not.

A quick sense of scale on data: 30 GB a month is comfortable for maps, messaging, music and a few videos. 10 GB a month is fine if you're mostly on wifi at home and using data for navigation and chat.

📱 The switch-over, in order, so you never go dark

This is the part that goes wrong. Your phone can hold the plans — Apple says an iPhone stores 8 or more eSIMs and can run 2 at once, and Google says a Pixel 7 or later can have 2 eSIM profiles active if the carrier allows it. The risk isn't storage. It's the download.

You need working internet to download a new eSIM profile. If you wait until your current plan dies, you're standing in a station with no way to buy your way out. So do this instead.

1. Three days before expiry, buy the next plan. Not the morning of. You want a buffer.

2. Check when the clock starts before you install anything. This differs by plan and it's the single biggest trap. Sakura Mobile's own page says its 3 GB/day docomo eSIM counts the day you install it as day one, while its unlimited 5G plan starts on arrival in Japan. Japan Wireless says its eSIMs activate when you land and turn on data roaming. Holafly says the plan starts when the eSIM first connects to a network.

3. If the clock starts at install, don't install early. Keep the QR code or activation code safe and install it on switch-over evening instead.

4. If the clock starts at first connection, install now and leave the line switched off. The profile sits quietly in your phone. On iPhone that's Settings → Cellular; on Pixel, Settings → Network & internet → SIMs.

5. Switch over in the evening, on wifi. Turn the new line on, then set it as your data line — on iPhone, Settings → Cellular → Cellular Data; on Pixel, Settings → Network & internet → SIMs → Mobile data. Google notes only one SIM can be the default for data.

6. Leave the old line switched on overnight as a safety net, if your phone allows two active. Test the new one on mobile data with wifi off — load a map, send a message.

7. Delete the old profile only when the new one has worked for a day. Deleting an eSIM is usually permanent.

🧳 Three things that catch long-stayers out

A one-day overlap is worth the money. Buying your next 30-day plan a day early costs you one day of duplicate service. Losing your maps on a travel day costs a lot more.

Data-only plans give you no Japanese phone number. That's fine for maps and messaging apps. It's not fine for booking a restaurant, registering at a gym, or opening a bank account. If any of that is on your list, look at a voice plan from the start rather than switching later.

"Unlimited" usually has a hotspot limit. Sakura Mobile's unlimited eSIMs cap the hotspot allowance depending on plan length, and Holafly's page states 1 GB per day of sharing. If you plan to work off a laptop, read the hotspot line, not the headline.

❓ Common questions

Can I really not buy one 90-day eSIM?
You can, from a few sellers — Sakura Mobile and Holafly both list durations up to 90 days. But most of the market stops at 30, and Sakura's own 93-day physical SIM is delivered as three separate 30-day cards, so you'd still be switching.

Will stacking two plans confuse my phone?
No. An iPhone stores 8 or more eSIMs and lets you turn each one on or off in Settings; a Pixel 7 or later handles two active profiles. You're choosing which line carries data, nothing more.

I'm a tourist on 90 days. Can I get a cheap Japanese monthly plan?
Most require a residence card, which Temporary Visitor status doesn't come with. Mobal is the notable route that says it doesn't need one for overseas customers, though you'll still go through ID verification.

What if my plan expires while I'm out and I have no signal?
Find wifi — convenience stores, cafés, most stations and airports have it. Then install the profile you already bought. This is exactly why you buy the next plan before the current one ends.

Does my home eSIM have to come off?
No. Keep it installed with data switched off. It'll be there when you fly home, and you can still receive calls or verification codes if you leave the line active and accept roaming charges.

Sources

• Prepaid Prices — eSIM, SIM & Pocket WiFi for Japan — Sakura Mobile (accessed 2026-09-03)
• Sakura Mobile TRAVEL eSIM — Sakura Mobile (accessed 2026-09-03)
• Pricing — SIM Card Monthly Plans for Japan — Sakura Mobile (accessed 2026-09-03)
• Choose Data Plan — Japan Wireless eSIM — Japan Wireless (accessed 2026-09-03)
• Japan Travel SIM (Prepaid SIM) — IIJmio (Internet Initiative Japan) (accessed 2026-09-03)
• Japan eSIM — Unlimited Data Plans — Holafly (accessed 2026-09-03)
• eSIM Japan 10GB — 30 days — Ubigi (Transatel) (accessed 2026-09-03)
• Japan SIM Card — Data & Phone Number Plans — Mobal (accessed 2026-09-03)
• eSIM Japan — Japanese Phone Number — Mobal (accessed 2026-09-03)
• Use eSIM on iPhone or iPad when you travel — Apple (accessed 2026-09-03)
• Use 2 SIMs on your Pixel phone — Google (accessed 2026-09-03)
• 2.7 Residence card and residence management system — JETRO (Japan External Trade Organization) (accessed 2026-09-03)
• Notice Regarding Changes to Identity Verification Methods for New Contracts — povo (KDDI) (accessed 2026-09-03)