Cheapest unlimited eSIM for Japan? From €2.95 for 1 day (October 2026)

The unlimited eSIM for Japan from Roam2Go starts from €2.95 for 1 day, a perfect option if your trip is short and you want unlimited data without watching the counter. If you need a few extra days’ flexibility, the 5-day plan comes to €11.95, all inclusive and with no roaming surprises.

In Japan, connectivity is key: from navigating the Tokyo metro to finding the perfect restaurant in Kyoto or sharing photos in real time, your phone is your best companion. Here we walk you through all the available plans and how to choose the one that suits your trip best.

All Roam2Go plans for Japan: comparison table

Roam2Go offers a wide range of plans for Japan, from budget-friendly options with limited data to unlimited plans designed for heavy travellers. All prices are in euros, with no hidden costs.

Roam2Go prices updated on 23 October 2026. Prices may vary; always check the product page before purchasing.

Unlimited plans for Japan: 3, 5 and 7 days

Whether your trip is an action-packed short break — the classic 3 or 4 days in Tokyo and Osaka — or a week of constant travel between cities, the unlimited plans are the most practical choice. No need to worry about managing your balance or rationing your usage: maps, social media, streaming, and browsing without limits.

Unlimited 3 days — €8.50

Ideal for long weekend getaways or very concentrated stays. Three days is extremely common among travellers doing a quick route or combining Japan with other Asian destinations (if those include Hong Kong or Macau, see the unlimited eSIM for China, Hong Kong and Macau). At €8.50, it’s the cheapest way to get three days of unlimited data; if you only need one day, there is a 1-day unlimited plan for €2.95.

Unlimited 5 days — €11.95

The best option if you want to cover the classic Tokyo–Kyoto–Osaka triangle, or if you’re adding day trips to Nara, Hiroshima, or Hakone. Five days of unlimited data for under €12 is generally enough for most independent travellers with a moderate-to-high level of phone usage.

Unlimited 7 days — €15.99

For a full week on the road, with plenty of train journeys between cities and long days of maps and photos. If you’re staying longer, there are also unlimited plans for 10 days (€20.50), 15 days (€33.00) and 30 days (€46.95): you’ll find them all in the table above and on the product page.

Already sure the unlimited plan is right for you? Check the product page and buy your Japan eSIM here in under two minutes.

When does a limited data plan make more sense?

Not everyone needs unlimited data. If you’re on a longer trip (more than two weeks) and your usage is moderate — occasional map checks, messaging, and little video playback — a 5 GB or 10 GB plan for 30 days could offer better value. Here are some general guidelines:

• Light usage (maps, WhatsApp, emails): 1–3 GB is usually enough for a week.
• Moderate usage (social media, heavy Google Maps, the odd photo or video upload): 3–5 GB for 7–10 days tends to work well.
• Heavy usage (streaming, video calls, working remotely): unlimited plans take all the guesswork away.

If you’re unsure how much data you’ll need, remember you can read our guide on how an eSIM works to better understand how to manage your usage while travelling.

Why choose an eSIM instead of your operator’s SIM?

Japan is one of those destinations where international roaming from European operators can be particularly expensive — or simply not included in standard packages. A Roam2Go eSIM gives you a fixed price in euros that you know and agree to before leaving home, with no surprise bills when you return.

What’s more, because it’s an eSIM, there’s no physical card to wait for or risk losing. You buy it online, receive the QR code by email, and install it on your phone whenever you like — even days before your trip. If you’d like to compare your options, you can also read our guide: eSIM or physical SIM — which to choose for travel.

How to activate your Japan eSIM step by step

Activating your Roam2Go eSIM for Japan is straightforward and requires no technical know-how:

1. Purchase the plan that best suits your trip on the Japan page at Roam2Go.
2. Check your email: you’ll receive the QR code within a few minutes.
3. Scan the QR code from your phone’s settings (Mobile Data > Add Mobile Data Plan).
4. Select the Roam2Go eSIM as your data plan when you land in Japan, and you’re all set.

You can complete the whole process at your leisure from home. No need to wait until you reach the airport or hunt down a local SIM shop with jet lag.

Frequently asked questions

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