Holafly's unlimited-data eSIM for Japan is a solid product for a specific kind of traveller, but most visitors will get better value from a fixed-data plan like eSIMpass's Japan eSIM, starting at £1.75. Both run on the same Japanese networks, so the real question is not coverage - it is whether you actually need "unlimited" data, and whether the fine print behind that word fits how you travel. This review lays it out fairly so you can decide.
We sell eSIMs, so treat this as an interested opinion. But we have tried to be accurate rather than dismissive, because Holafly is a genuine, well-run provider, and for heavy streamers it can be the right call.
What Holafly Actually Sells for Japan
Holafly's headline Japan product is an unlimited-data eSIM sold by number of days rather than by gigabytes. You pick a duration, install a QR code, and use data without a hard cap on total volume. It connects to a major Japanese network, with excellent coverage in Tokyo, Osaka, Kyoto, and along the Shinkansen corridors.
Like eSIMpass and most travel eSIMs, it is prepaid and data-only, with no Japanese phone number and no voice or SMS line. We will come back to that, because it matters for both providers.
The Word "Unlimited" Deserves a Footnote
This is the part most reviews gloss over. On travel eSIMs, "unlimited" almost never means uncapped, full-speed data forever. It typically means unlimited volume subject to a fair-use policy:
- A daily high-speed allowance. You get full 4G/5G speeds up to a set amount of data each day. After that, speeds are throttled for the rest of that day, then reset the next morning.
- Hotspot and tethering limits. Many unlimited plans restrict, cap, or exclude sharing your connection to a laptop or a second device. If you plan to work off a laptop, read this clause carefully before buying.
None of this is unique to Holafly - it is how the whole "unlimited eSIM" category works, and it is standard practice from Japanese networks upstream. The point is simply that "unlimited" is a marketing word with real conditions behind it. Check the current fair-use terms on the provider's own page before you buy, because those numbers change.
Fixed-Data vs Unlimited: The Honest Trade-off
Here is the core decision, without spin.
A fixed-data plan gives you a set number of gigabytes for a set number of days - for example 3GB, 5GB, or 10GB. You pay once, you know exactly what you have, and you size up if you run low. The Japan eSIM from eSIMpass works this way.
An unlimited plan removes the "will I run out?" anxiety entirely, in exchange for a higher price per trip and the fair-use conditions above.
For most travellers the maths favours fixed data. Typical sightseeing - maps, messaging, social media, the odd video call home - burns roughly 300-600MB a day. On a week-long trip that sits comfortably inside a mid-size fixed plan, at a lower total cost than an unlimited one. You are paying an unlimited premium to insure against data you were never going to use.
Where unlimited genuinely earns its price is the opposite profile: you stream for hours daily, rely on live navigation constantly while driving, upload large files on the go, or simply do not want to think about a data counter at all. If that is you, unlimited can be worth every yen.
Who Should Pick Unlimited (and Who Should Not)
Unlimited is a good fit if you:
- Stream Netflix, YouTube, or Twitch for several hours a day
- Take long road trips with constant turn-by-turn navigation
- Are on a long stay and would rather not manage top-ups
- Value zero data anxiety over saving money
A fixed-data plan is the better fit if you:
- Take a normal sightseeing trip of a few days to two weeks
- Mostly use maps, chat, social media, and web browsing
- Want the lowest total cost for the trip
- Like knowing your exact allowance up front
There is no universally "best" answer here - it is a genuine fork based on your usage, and being honest about your own habits saves you money either way. If you want a broader primer, our travel eSIM guide walks through how to size a plan, and for a wider provider comparison see our Airalo vs Ubigi vs eSIMpass for Japan deep dive.
eSIMpass's Japan Plan and Pricing
| 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 |
These are fixed-data plans starting at £1.75, running on a major Japanese network with 4G/5G in cities and along the main rail lines. Delivery is an instant QR code by email, with no activation fee and no roaming charges on top. Because you choose your gigabytes, a light traveller pays light, and a heavier user can size up - often still below the cost of an unlimited plan for the same trip.
Not sure how much you need? This helps:
Neither Plan Gives You a Japanese Phone Number
Worth stating plainly, because it applies to Holafly and eSIMpass equally: these are data-only eSIMs. You will not get a Japanese mobile number. For nearly all visitors this is a non-issue, thanks to the standard dual-SIM setup:
- Keep your home SIM active for calls and SMS (with data roaming switched off so it never charges you), and set the eSIM as your data line.
- Make calls over the internet. WhatsApp, FaceTime, and LINE - which is the dominant messaging app in Japan - all work fine over your eSIM data for calls and texts. Restaurants, tour guides, and hotels in Japan very often use LINE, so installing it before you go is a smart move.
This keeps your usual number reachable for the two-factor codes and airline texts you actually care about, while the eSIM handles all the data.
Pocket Wi-Fi: The Other Japan Option
Japan is one of the few countries where rental Pocket Wi-Fi is still genuinely popular, so it is worth an honest comparison. A Pocket Wi-Fi is a small hotspot device you rent for the trip and hand back at the airport.
- In its favour: it shares one connection across several phones and laptops, which suits families or work trips, and it keeps your phone's own SIM untouched.
- Against it: it is one more gadget to carry and charge, its battery is a single point of failure for your whole group, you have to collect and return it, and per-trip it usually costs more than a solo traveller's eSIM.
For one or two people, an eSIM is simpler and cheaper. For a group that needs to share, Pocket Wi-Fi still has a real case.
How to Install a Japan eSIM
Both Holafly and eSIMpass install the same way, in under three minutes:
- Buy your plan and complete checkout
- Receive the QR code by email, instantly
- Scan it in Settings before you fly - installation needs Wi-Fi, activation later does not
- Set it as your data line and turn on data roaming for the eSIM
- Land and connect at Haneda, Narita, or Kansai the moment you leave airplane mode
For step-by-step help see our eSIM setup and activation guide, or grab a plan on arrival via the Haneda airport eSIM or Narita airport eSIM page. If you are unsure your handset supports eSIM, check the compatible devices list first.
The Bottom Line
Holafly's unlimited Japan eSIM is a legitimate, well-supported product. If you are a heavy streamer or a constant-navigation road-tripper who wants zero data anxiety, it can be worth it - just read the fair-use daily throttle and the tethering rules first, because those define what "unlimited" means for you.
For the typical traveller doing a week or two of sightseeing, a fixed-data plan is better value. Same networks, same speeds, you know exactly what you are paying for, and you almost always spend less. That is why, for most trips, we would point you to a fixed Japan eSIM sized to your actual usage rather than an unlimited plan you will not fully use.
Frequently Asked Questions
Is Holafly's Japan eSIM really unlimited?
It is unlimited in total volume, but subject to a fair-use policy that typically gives you full speed up to a daily amount and then throttles you for the rest of that day. That resets each day. Always check Holafly's current fair-use terms on their own page, as the specific numbers change over time.
Can I use a hotspot with an unlimited eSIM?
Sometimes, but not always. Many unlimited plans limit, cap, or exclude tethering, and the exact rule varies by provider and plan. If sharing to a laptop or a second device matters to you, confirm the tethering clause before buying. Fixed-data plans like eSIMpass's Japan eSIM generally allow hotspot use, drawing from your gigabyte balance.
Is unlimited data cheaper than a fixed-data plan?
Usually no, per trip. Unlimited plans carry a premium for removing the cap. If you only use a few hundred megabytes a day for maps and messaging, a fixed plan costs less for the same trip. Unlimited pays off mainly for heavy daily streaming or constant navigation.
Do Holafly and eSIMpass use the same networks in Japan?
Yes, broadly. Reputable Japan eSIMs, including both of these, connect to a major Japanese network (such as NTT Docomo, SoftBank, or au). Coverage and speed in cities and along the Shinkansen lines are comparable. The main difference is the pricing model, not the signal.
Will either eSIM give me a Japanese phone number?
No. Both are data-only, so neither provides a Japanese number for calls or SMS. Keep your home SIM active for texts and calls (with roaming data off), use the eSIM for data, and make calls through WhatsApp, FaceTime, or LINE, which is the messaging app most used in Japan.
How much data do I actually need for Japan?
For normal sightseeing, budget roughly 300-600MB per day, so a week runs around 3-5GB. Heavy users who stream, video call, and back up photos daily may want 10GB or more, and for them a large fixed plan or an unlimited plan both make sense. Run your habits through the data calculator above to be sure.
Heading to Japan? Pay only for the data you'll use.
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