Cheapest eSIMs for Japan Trips (2025) | Compare Budget Japan eSIM Plans

A few years ago, I got completely lost in Osaka after getting off at the wrong train station. It was pouring rain, my umbrella had flipped inside out, and Google Maps was spinning like a roulette wheel. But somehow, that wrong turn led me to a tiny standing sushi bar tucked behind a vending machine. No tourists, no English menu - just incredible tuna and the kind of serendipity Japan seems to serve up daily.

That’s the thing about Japan - getting a little lost is part of the charm. But having a reliable, affordable eSIM helps a lot when you're trying to get un-lost. In this guide, I’ll walk you through the cheapest eSIM options for Japan travel in 2025, from budget plans to unlimited data, and what to watch out for with each provider. Whether you're staying a week or a month, let’s find a plan that actually fits your trip.

Why Use a Cheap eSIM for Japan Travel

Let’s be real - Japan’s already expensive enough. Between JR Passes, ramen binges, and souvenir overload, the last thing you want is to overpay for mobile data. That’s where a cheap eSIM for Japan can really save the day. And no, cheap doesn’t mean dodgy. Some of the best Japan eSIMs (like the ones we offer at ZenSim) are low-cost but seriously reliable, with fast speeds and great support.

eSIMs in general are a great fit for Japan travel. You can activate them instantly, skip the queue at the airport, and never worry about losing a tiny plastic SIM. If you’re looking for a deeper dive on the subject checkout out our best eSIMs for Japan article.

Cheapest Japan eSIMs - Quick Comparison

There are quite a few eSIM providers out there now, but when you strip away the marketing fluff, only a handful really stand out for value. I’ve compared four of the biggest names: ZenSim (that’s us), Sakura Mobile, Ubigi, and Holafly. Each takes a slightly different approach - some focus on unlimited data, others on low entry prices, and some… well, make it really hard to figure out what you're actually paying for.

This section breaks down short-term and long-term options to help you find the best eSIM for Japan based on your trip length, data needs, and how much patience you have for confusing websites.

Cheapest Short-Term eSIM Plans (5-10 Days)

If you're popping into Japan for a quick getaway, you’ll probably only need around 5GB to 10GB of data - perfect for maps, Insta, and the occasional Tokyo café search. ZenSim keeps it simple with a 5GB plan for A$18 ($11 USD) and a 10GB plan for A$27 ($17 USD), both valid for 10 days.

Ubigi’s slightly cheaper on paper for 10GB at A$22 ($14 USD), but that plan only lasts 7 days instead of 10 like the other comparisons. Sakura Mobile, on the other hand, charges A$35 ($23 USD) for 5GB and A$51 ($33 USD) for 10GB - both decent plans but slightly more expensive.

Holafly skips this category altogether. No small plans, just straight into unlimited. That’s fine for heavy users, but if you’re after a cheap Japan eSIM for a short stay, ZenSim and Ubigi are your best bets.

Cheapest Long-Term eSIM Plans (30 Days+)

For longer trips or digital nomads, the 30-day plans are where things get interesting. ZenSim’s 10GB for A$29 ($18 USD) or 20GB for A$49 ($30 USD) cover most use cases without overkill. And if you need more? Just top up anytime through the app - easy as.

Ubigi stays competitive with 10GB for A$26.50 ($17 USD) and 20GB for A$48 ($31 USD), though they don’t support on-the-fly top-ups the same way. Holafly and Sakura both go heavy on the “unlimited” angle, but with higher price tags and fuzzy fair usage terms.

Worth noting: Sakura offer “90-day plans” on their site, but they’re actually just one 30-day plan plus two auto-renewing top-ups. So if flexibility matters and you don’t want to be locked into a full 3-month commitment upfront, ZenSim’s manual top-up model is a bit more forgiving.

Best Budget eSIMs for Japan - Our Picks

There’s no one-size-fits-all when it comes to eSIMs, especially for Japan travel. Some people want the lowest price, others want longer validity, and some just want an easy way to stay connected without overthinking it. So here are my top picks based on different needs - all of them solid, but some definitely stand out more than others.

Best Overall Value - ZenSim

If you're after balance - price, simplicity, and flexibility - ZenSim is hard to beat. The 10GB for A$29 ($18 USD) or 20GB for A$49 ($30 USD) 30 day plans offer more data for less, and you can top up as many times as you like. We’ve kept things simple on purpose: no confusing bundles, no sneaky fees, and no trying to trick you into paying more. The app lets you check your balance and manage your plan without hassle, and our support team is actually responsive (wild, I know). For most travellers, this is the sweet spot.

Best for Super Short Trips - Ubigi

If you’re just popping in for a few days and only need a bit of data to get around, Ubigi does a decent job. Their 5GB for A$19 ($12 USD) plan gives you 15 days of access, and their 10GB plan is only A$22 ($14 USD) - though it only lasts 7 days. Not ideal if you’re stretching your stay, but for light users or stopovers, it gets the job done.

Best for Local Phone Numbers - Sakura Mobile

If having a local Japanese phone number is important to you - maybe for receiving calls or registering for certain services - Sakura Mobile is the go-to. They’re the only major eSIM provider offering this as part of their plans. Just be prepared to pay for the privilege.

Their pricing is significantly higher across the board. For example, 10GB over 10 days will cost you A$51 ($33 USD), and their 20GB plan hits A$73 ($47 USD). That’s more than double what some others charge. So while it’s functional and locally integrated, it’s not what I’d call budget-friendly.

Best Unlimited Plan - ZenSim

Unlimited plans are one of the trickiest things to compare because every provider defines "unlimited" differently. Holafly doesn’t publish any clear usage policy, but they do slow you down at some point - you just won’t know when. Ubigi offers an “unlimited” plan too, but it’s actually capped at 60GB over 30 days.

ZenSim keeps it simple. Our unlimited Japan eSIM is A$109 ($66 USD) for 30 days, with up to 3GB per day at full speed before speeds are slowed. That daily cap resets every 24 hours, so you’re never stuck crawling through the internet for days on end.

Sakura Mobile has a similar 3GB/day plan priced slightly lower at A$94 ($61 USD), which might be tempting if you’re counting every dollar. But with ZenSim, you’re getting more than just data - our customers consistently mention our responsive, friendly support, and being able to manage everything in-app makes life easier while you’re travelling.

Popular Japan eSIM Plans Compared

Here’s where things get really useful - a side-by-side comparison of the most common Japan eSIM plans. I’ve broken it down by data tier so you can quickly see what each provider offers and how the pricing stacks up. If you're anything like me, this is the kind of cheat sheet you want before making a call on which eSIM to grab.

5GB Plans for Japan (Best for Light Users)

• ZenSim - A$18 ($11 USD) for 10 days
• Ubigi - A$19 ($12 USD) for 15 days
• Sakura Mobile - A$35 ($23 USD) for 10 days - Most expensive
• Holafly - Not available

If you’re mostly relying on Wi-Fi and just need some data for navigation and messaging, 5GB will do the trick. ZenSim edges out Ubigi by a dollar, and you get a full 10 days of coverage. Sakura’s option is significantly more expensive for the same data.

10GB Plans for Japan (Great for 1-2 Week Trips)

• ZenSim - A$27 ($17 USD) for 10 days or A$29 ($18 USD) for 30 days
• Ubigi - A$22 ($14 USD) for 7 days or A$26.50 ($17 USD) for 30 days
• Sakura Mobile - A$51 ($33 USD) for 10 days
• Holafly - Not available

If you’re staying a bit longer or like streaming the occasional video, 10GB is the sweet spot. ZenSim and Ubigi are neck and neck on price, but ZenSim’s 10-day option offers better flexibility if 7 days feels too short.

20GB Plans for Japan (Best for Regular Usage)

• ZenSim - A$49 ($30 USD) for 30 days
• Ubigi - A$48 ($31 USD) for 30 days
• Sakura Mobile - A$73 ($47 USD) for 30 days
• Holafly - Not available

20GB is great for regular use - think Google Maps, social media, YouTube, and maybe a bit of hotspotting. ZenSim and Ubigi are almost identical on price here, though ZenSim’s customer support and easy top-ups might tip the scales.

Unlimited Plans for Japan (Heavy Users & Streamers)

• ZenSim - A$109 ($66 USD) for 30 days (3GB/day before slowed)
• Sakura Mobile - A$94 ($61 USD) for 30 days (3GB/day before slowed)
• Ubigi - A$107 ($69 USD) for 30 days (60GB total before slowed)
• Holafly - A$117 ($74.90 USD) for 30 days (usage cap not disclosed)

Unlimited is ideal if you’re constantly online or using your phone for work. Just keep in mind that most “unlimited” plans have fair use limits. ZenSim is upfront about the 3GB/day cap, while Holafly doesn’t disclose any limits at all, which can be frustrating if your speeds get throttled unexpectedly.

How to Choose the Right eSIM for Japan

Choosing the right eSIM really comes down to how you use your phone. If you’re in Japan for a short holiday and just want enough data to check maps, translate menus, and post a few photos, a 5GB or 10GB plan should be more than enough. For longer stays or heavier use (like streaming, video calls, or hot spotting), a 20GB or unlimited plan will give you peace of mind.

ZenSim offers flexible top-ups, so if you’re unsure, you can start small and add more later. And if Japan’s just one stop on a bigger trip, you might want to look at providers that support multiple countries. Want to dig deeper? See our [best eSIMs for Japan](/blog/best-esim-options-for-japan-travel-2025/).

Things to Watch Out For with Japan eSIMs

Once you start comparing Japan eSIMs, you’ll notice the devil’s in the details. A few things are worth double-checking before you buy, especially if you want to avoid mid-trip headaches.

First, look out for hot spotting limits. Some providers restrict it entirely, and others cap it quietly. Holafly, for example, limits hotspot usage to just 500MB per day - something most people don’t find out until it’s too late. ZenSim doesn’t play those games - we offer unlimited hotspotting across all plans so you can tether without stress.

Then there’s the issue of daily usage caps. Holafly doesn’t disclose theirs at all, which isn’t ideal if you’re relying on consistent speeds. Ubigi’s “unlimited” plan is actually capped at 60GB total over 30 days, which is fine for moderate use but is basically a 60GB plan.

You’ll also want to check whether your provider has an app and supports top-ups. Being able to check your balance or add more data on the go makes a big difference. ZenSim lets you manage everything from your phone, no need to deal with clunky websites or starting over with a new plan.

And finally, customer service. Some providers are slow to reply or hard to get in touch with. We’ve had plenty of travellers switch to ZenSim after getting stuck with a provider that ghosted them.

FAQs About Budget eSIMs in Japan

Still got questions? Totally fair. Choosing the right Japan eSIM can be a bit of a maze, especially with so many providers throwing around terms like “unlimited” or “best coverage” without much context. Here are some of the most common questions I get asked - and a few things I wish I’d known on my first trip.

Will a cheap Japan eSIM work across the country?

Yes - as long as the provider uses a major Japanese network, you’ll be fine. The customer reviews are the best place to check this out and see what others have experience. ZenSim eSIMs connect to top-tier local networks just FYI.

Can I top up or extend my Japan eSIM plan?

With ZenSim, absolutely. You can top up anytime right from our app - super handy if your trip runs longer than expected or you burn through your data quicker than planned. A lot of other providers require you to buy a whole new eSIM, which can get annoying fast if you're halfway through your travels and just need a bit more data.

Is “unlimited” really unlimited when it comes to Japan eSIMs?

Not really. Most “unlimited” Japan eSIMs have a fair usage policy - the tricky part is whether or not the provider tells you what it is. ZenSim unlimited plan gives you 3GB per day at full speed before slowing, and that cap resets every 24 hours. Holafly, on the other hand, doesn’t disclose theirs at all, and Ubigi caps theirs at 60GB total over 30 days.

Final Thoughts - Get the Best eSIM for Your Japan Trip

There’s no shortage of options when it comes to Japan eSIMs, but once you start digging into the pricing, data limits, and fine print, the gaps between providers get pretty obvious. If you’re after something affordable, transparent, and easy to manage while travelling, ZenSim genuinely holds up. The ability to top up whenever you want, manage your plan through the app, and actually get help when you need it makes a huge difference on the road.

Of course, if you're still comparing providers or want to go even deeper into the details, check out our full guide to the best eSIM options for Japan travel. It covers everything from setup tips to provider comparisons and can help you feel confident before you hit that “buy now” button.