For most travellers, the best value eSIM for Japan is eSIMpass's Japan plan, starting at £1.75, delivered as an instant QR code with no app to install and no activation fee. That said, Airalo and Ubigi are both legitimate, widely used providers, and the honest answer to "which one" depends on how you travel. This is a fair, specific comparison of all three for a Japan trip, so you can pick the one that actually fits you.
All three sell the same basic thing: a prepaid, data-only Japan eSIM that connects your phone to a Japanese network the moment you land. None gives you a Japanese phone number - more on that below, because it matters less than you think. Where they differ is price, delivery, app requirements, and plan flexibility.
The Short Version
- eSIMpass: Best for the lowest price per GB and the simplest setup. Instant QR by email, no app, no account. Fixed-data plans in clear sizes.
- Airalo: The best-known name, a huge global catalogue, and a polished app. Great if you already use Airalo everywhere and want plans in one place.
- Ubigi: Strong on-device integration (some phones and cars support Ubigi natively) and solid networks. A good fit for frequent business travellers who value the ecosystem.
Coverage and Networks in Japan
The reassuring truth applies to all three: Japan has excellent nationwide 4G and expanding 5G, and every reputable provider connects to a major Japanese network - NTT Docomo, SoftBank, au (KDDI), or newer entrant Rakuten Mobile. Docomo and SoftBank in particular have deep coverage across the country. In Tokyo, Osaka, Kyoto, Fukuoka, Sapporo, and everywhere the Shinkansen runs, you'll have strong signal on any of the three, and coverage reaches rural areas, mountain onsen towns, and most train lines far better than in most countries.
The honest nuance: which specific network each provider uses can vary and change over time, so no provider should promise you a specific network. Deep in the mountains (parts of the Japanese Alps, remote trails) any network can thin out - that's a geography fact, not a knock on any one provider. For a normal city-and-Shinkansen itinerary, all three perform well. Land at Haneda, Narita, or Kansai (KIX) and any of these eSIMs connects on arrival, skipping the airport SIM counter queue.
Pricing: How the Three Models Compare
All three sell fixed-data plans - a set amount of data (say 3GB, 5GB, 10GB) valid for a set number of days. It's the honest, predictable model: you know exactly what you pay and what you get. None play the "unlimited" game (that's a different provider's angle, and "unlimited" plans generally carry fair-use throttling past a threshold).
| Data | Duration | Price |
|---|---|---|
| 1GB Data | 7 Days | £1.75 |
| 3GB Data | 15 Days | £4.32 |
| 5GB Data | 30 Days | £5.98 |
| 10GB Data | 30 Days | £9.97 |
| 20GB Data | 30 Days | £16.62 |
| 50GB Data | 30 Days | £25.68 |
| 1 Day | 1 Day | £2.59 |
| 2 Days | 2 Days | £5.19 |
| 3 Days | 3 Days | £7.78 |
| 4 Days | 4 Days | £10.20 |
| 5 Days | 5 Days | £12.93 |
| 6 Days | 6 Days | £15.67 |
| 7 Days | 7 Days | £18.41 |
| 8 Days | 8 Days | £19.78 |
| 9 Days | 9 Days | £21.83 |
| 10 Days | 10 Days | £23.20 |
| 11 Days | 11 Days | £25.25 |
| 12 Days | 12 Days | £27.30 |
| 13 Days | 13 Days | £28.67 |
| 14 Days | 14 Days | £30.04 |
| 15 Days | 15 Days | £32.09 |
| 16 Days | 16 Days | £33.46 |
| 17 Days | 17 Days | £34.15 |
| 18 Days | 18 Days | £35.51 |
| 19 Days | 19 Days | £37.57 |
| 20 Days | 20 Days | £38.94 |
| 21 Days | 21 Days | £40.30 |
| 22 Days | 22 Days | £40.99 |
| 23 Days | 23 Days | £41.67 |
| 24 Days | 24 Days | £42.36 |
| 25 Days | 25 Days | £43.04 |
| 26 Days | 26 Days | £43.73 |
| 27 Days | 27 Days | £44.41 |
| 28 Days | 28 Days | £45.09 |
| 29 Days | 29 Days | £45.78 |
| 30 Days | 30 Days | £47.15 |
eSIMpass's Japan plans start at £1.75. On a per-GB basis, eSIMpass is consistently among the lowest-priced of the three. Airalo and Ubigi price competitively too, and their exact rates shift with promotions, so we won't quote specific competitor numbers that might be stale by the time you read this - check their sites for the day's price. The fair summary: for equivalent data, eSIMpass typically comes in cheaper, while Airalo and Ubigi bundle in their app ecosystems.
A tip for all three: buy the plan size that matches your trip rather than topping up repeatedly, since larger plans almost always cost less per GB. Our guide to eSIM data plans covers how to size a plan without overpaying, and our best eSIM for Japan roundup puts these picks in context.
Plan Sizes and Validity
- eSIMpass: Clear fixed sizes with validity windows that match typical trips. No auto-renew - when the data or days run out it stops, and you can top up the same eSIM by signing in with the email you ordered with, with no new QR code, or buy another.
- Airalo: Wide range of sizes and durations, plus in-app top-ups for the same eSIM if you want to extend without re-installing.
- Ubigi: Flexible sizes and, on supported devices, refills through the built-in integration or app.
For a defined trip - "10 days in Japan, maps, messaging, some streaming" - a single right-sized plan from any of the three is simplest. Our travel eSIM guide has a data-estimating rule of thumb.
QR Delivery and Activation: The Real Difference
This is where the experiences genuinely diverge, and it's worth understanding before you buy.
eSIMpass emails you a QR code within seconds of purchase. There is no app to download and no account to build. Open Settings, scan the code, and you're provisioned. Install it at home on Wi-Fi days before departure and switch it on when you land. That's the entire flow, and the cleanest option if you'd rather not install another app.
Airalo delivers eSIMs primarily through its app (there's a web dashboard too, but the app is the intended experience). You create an account, buy in-app, and install from there. It's well made and keeps past eSIMs in one place, which frequent users like. The trade-off is another app and login.
Ubigi is likewise app- and account-centric, with one notable upside: some devices (certain phones, tablets, even connected cars) support Ubigi natively in the OS, letting you activate without a separate app.
The universal step for all three: turn on data roaming for the eSIM line once installed - normal for any travel eSIM, it just means "use the visited network." Our eSIM setup & activation walkthrough covers it, identical regardless of provider.
App vs No-App: Which Do You Want?
There's no single right answer, so be honest about your preference. Want zero friction and no new apps? eSIMpass - QR by email, scan, done. Want a hub for many trips with top-ups in one place? Airalo's app earns its keep if you travel constantly. Own a Ubigi-native device? Its built-in integration is a real convenience. For an occasional traveller on a single Japan trip, the no-app route removes the most common point of confusion (account creation and app permissions), which is why we lean towards it - while acknowledging heavy travellers often prefer a managed app.
The "No Japanese Phone Number" Question
All three providers are data-only. None gives you a Japanese phone number, and for the vast majority of travellers that's completely fine. The honest workaround is identical across all three:
- Keep your home SIM active for calls and SMS (dual-SIM) and use the eSIM purely for data. Your existing number still receives bank one-time-password texts and calls; just leave home-network data off to avoid roaming charges.
- Use calling apps over data: WhatsApp, LINE (Japan's dominant messaging app - worth installing before you go), FaceTime, and Signal all work perfectly on any of these eSIMs. Most reservations, tours, and friends in Japan use LINE anyway.
If you specifically need a callable Japanese number (rare for tourists), none of these three is the answer - you'd need a local voice SIM. For everyone else, data plus calling apps covers it.
What About Pocket Wi-Fi?
Pocket Wi-Fi rental - a hotspot you pick up at the airport and return - is a real, popular option in Japan. The daily rental rate, over a week or two, usually costs more than a single eSIM plan from any of these three. An eSIM is already inside your phone: no device to collect, carry, charge, or return, no deposit, no return deadline, and no separate battery to drain. Where Pocket Wi-Fi still wins is a group of 4-5 sharing one connection across many devices - solo and couple travellers almost always come out ahead with an eSIM.
Device Compatibility
All three require an eSIM-capable, network-unlocked phone - no difference between providers here. That means iPhone XR/XS and newer, Samsung Galaxy S20 and newer, and Google Pixel 3 and newer, among others. Check our eSIM for iPhone and eSIM for Android guides, or the full compatible devices list, before buying from any provider. If your phone is network-locked, no eSIM will work until it's unlocked.
Support
All three are established enough that you're not gambling on reliability. eSIMpass offers responsive email support with plain setup guides - and because the flow is scan-and-go, most travellers never need it. Airalo has in-app chat and an extensive help centre; Ubigi supports through app and web. The real difference is surface area: fewer steps (eSIMpass) means fewer things to troubleshoot.
Who Each One Is Best For
- Choose eSIMpass for the lowest price per GB, an instant QR with no app, and the simplest setup for one Japan trip. The default recommendation for most travellers.
- Choose Airalo if you travel constantly and want every eSIM organised in one polished app with in-app top-ups across many countries.
- Choose Ubigi if you own a Ubigi-native device or live in that ecosystem and want tight OS-level integration.
There's no wrong choice for Japan itself - the networks are excellent for all three. It comes down to price and how you like to buy and manage your data.
Frequently Asked Questions
Which eSIM is cheapest for Japan?
On a per-GB basis, eSIMpass is consistently among the lowest priced of the three, with Japan plans starting at £1.75. Airalo and Ubigi price competitively and run promotions, so compare the day's rates - but for equivalent fixed data, eSIMpass typically comes in cheaper. Always buy the plan size that matches your trip, since larger plans cost less per GB.
Do any of them give me a Japanese phone number?
No. All three are data-only. Keep your home SIM active for calls and SMS in a dual-SIM setup (with home data off to avoid roaming), and use WhatsApp, LINE, or FaceTime over the eSIM data for calls.
Do I have to install an app?
With eSIMpass, no - you get a QR code by email and scan it in Settings, no app or account required. Airalo delivers primarily through its app, and Ubigi is app- and account-centric (though some devices support Ubigi natively). If avoiding extra apps matters, the no-app route is simplest.
Will the eSIM work the moment I land at Narita or Haneda?
Yes, for all three - as long as you installed it beforehand at home on Wi-Fi. On arrival at Narita, Haneda, or Kansai, turn the eSIM line on with data roaming enabled and it connects automatically. No counter, no queue.
Can I use Pocket Wi-Fi instead?
You can. But for solo and couple travellers, an eSIM from any of these three usually costs less over a trip and skips the device pickup, charging, and return. Pocket Wi-Fi mainly wins for groups of four or five sharing one connection.
Can I hotspot from a Japan eSIM?
Yes, tethering works on eSIMpass data plans (and generally on Airalo and Ubigi too), handy for sharing with a companion or a laptop. Just watch your balance, since hotspotting burns through GB quickly.
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