eSIM vs pocket Wi-Fi in Japan: which is best for travel?
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You’ve finally got the plane ticket to Japan. The trip schedule is already planned, and now the only question is how you will stay connected abroad. If you did a little research, you probably noticed the eSIM vs pocket Wi-Fi in Japan debate, with people divided on which option is better. While both ensure connectivity, they differ in price, setup, portability, and speed – to name a few. As an eSIM expert, I wanted to dig deeper into both of these options and find out which is better in the land of the rising sun.
This guide will help you understand how each option works and compare them based on travel style, data needs, and budget. Now, let’s look at which is better for you while exploring Tokyo’s sights, like Tokyo Tower or Harajuku Street, or even visiting historical cities like Kyoto, Osaka, or Okinawa.
What is pocket Wi-Fi?
Pocket Wi-Fi is a small device that you can take on your travels for internet access. No matter your destination, it connects to local cellular networks and creates private Wi-Fi access. Using local SIM cards or eSIM technology, it searches for the strongest available network. That means you get consistent coverage and optimal speed.
Tourists in Japan commonly use pocket Wi-Fi for reliable and secure internet without relying on public Wi-Fi or incurring costly roaming fees. As it works as a hotspot, you can connect multiple smartphones, tablets, and laptops simultaneously. Its battery life usually lasts 6-15 hours, depending on the device and usage, so it’s best to carry a portable battery (power bank) for prolonged connectivity throughout the day.
What is an eSIM?
An eSIM is a built-in SIM card that connects you to a mobile network. It's software-based, so no physical card is needed. Here's how it works: instead of inserting a physical SIM card from a carrier, you download a digital SIM profile straight to your phone. Your device then connects to your carrier's network just like it would with a traditional SIM – same data, but with way less hassle. Most flagship smartphones released in the last few years (like iPhones and Samsungs) already support eSIM technology.
What I really like about eSIMs is that they can store multiple profiles at once. That means you can switch between devices, networks, and plans within a few taps.
To purchase an eSIM, you don't have to go anywhere – you can do it via the provider's website or app, even before your trip. In most cases, you'll only need to download its app, create an account, and select a plan. Many eSIMs activate automatically upon arriving at the destination, so you don't have to worry about having an internet connection to activate it.
eSIM vs pocket Wi-Fi for Japan: overall comparison
While eSIM and pocket Wi-Fi serve the same purpose – providing internet access wherever you travel – they’re quite different in terms of features. I’ve compiled a comparison table where you can see how exactly they differ from price to setup or overall app experience. Let’s look at which one has the advantage.
| Feature | eSIM | Pocket Wi-Fi |
| Price (average/day) | $2.27-3.41 (depends on the plan) | ~$4.10 (for unlimited data plans) |
| Data limits | Unlimited or high-cap plans (depends on the provider) | Usually unlimited or large data caps |
| Speed | 4G/5G (depends on the provider and coverage) | LTE/4G (slightly slower, shared across devices) |
| Setup required | Quick install via provider’s app or website | Need to pick up at an airport or a hotel and return it later |
| Battery needed | No (uses phone’s battery) | Yes (requires a separate battery) |
| Allows tethering | Yes, if hotspot is allowed by the plan | Yes, can connect multiple devices |
| Device sharing | Limited to your phone (unless hotspotting) | Can share with others – supports 5-10 devices simultaneously |
| App experience | Most providers offer intuitive apps for setup, top-ups, and support | No dedicated app – managed via router interface |
| Customer support | Usually 24/7 in-app chat or email | Depends on the provider, often slower or email only |
| Risk of loss | None | Yes (may have replacement or damage fees) |
| Compatibility | Works with eSIM-compatible smartphones (recent iPhones, Androids) | Works with any Wi-Fi-enabled device |
| Portability | Fully integrated into your phone, nothing to carry | Extra device to carry + charger or power bank |
Pocket Wi-Fi vs eSIMs: pricing in Japan
The cost of a data plan is calculated differently for pocket Wi-Fi and eSIMs. Usually, the price for pocket Wi-Fi depends on the rental price per day, plus additional costs such as security deposit, insurance, or late return fees. eSIMs have flat prepaid pricing per data usage or duration. As it’s software-based, you don’t need to pay a deposit or other hidden charges. At the end of the day, eSIMs win as a more affordable solution.
For example, if you’re traveling to Japan short-term, you can expect to pay ~$28.70 for a pocket Wi-Fi’s 7-day unlimited data plan. An eSIM plan will cost you way less – $3.79/GB for 7 days or ~$23.87 for a 7-day unlimited data plan. Comparing their 14-day and 30-day plans, the price for pocket Wi-Fi plans tends to skyrocket while eSIM plans increase only slightly. For instance, pocket Wi-Fi costs ~$57.4 for 14 days and ~$123.00 for 30 days, as eSIM comes between $7.59 and $47.49 for 14 days and between ~$7.59 and $68.39 for 30 days.
On top of being a more affordable option, eSIMs are also easier to activate and top up. You can activate them and top up instantly via the app, while with pocket Wi-Fi, you need to go to the physical pick-up location, like the airport or hotel, and later return it to the same place.
| Feature | eSIM (e.g., Saily) | Pocket Wi-Fi (rental) |
| 7-day plan | ~$3.79-34.19 | ~$28.70 + security deposit, insurance, or late return fees |
| 30-day plan | ~$7.59-68.39 | ~$123.00 + security deposit, insurance, or late return fees |
| Deposit required | No | Yes ($44.00-113.00) |
| Setup | Instant (via app) | Requires pickup or delivery |
| Return process | Not needed | Need to return the device |
| Multi-device support | No, only 1 device per eSIM | Yes, typically 5-10 |
Pocket Wi-FI vs eSIMs: technical aspects
Pocket Wi-Fi and eSIMs are built differently and focus on different travel needs. For example, pocket Wi-Fi is meant for groups, while eSIMs – for solo travelers. Let’s look at each of them closer from a technical perspective.
Pocket Wi-Fi is a standalone device that creates a mobile hotspot. It supports multiple users, making it great for families or friends. On the downside, it needs daily charging (6-15 hours), adds bulk, and often requires a pickup or return. Speeds might slow down with shared use or data caps. Overall, I found it ideal for group travel or working remotely with laptops and tablets.
Software-based eSIMs offer instant activation, no added gear, and no extra battery drain (except your phone's). Speeds are typically fast via local carriers, and coverage is broad with regional/global plans. Its drawback is that it only supports one device unless tethered (which drains the phone's battery). With its minimal setup, no charging, and easy plan switching across countries, it's the best fit for backpacking, especially for solo travelers.
So, eSIMs suit solo and mobile travelers, while pocket Wi-Fi benefits groups or remote workers needing multiple connections.
eSIM vs pocket Wi-Fi Japan: which one should I choose?
If you're traveling to Japan, choosing between eSIM and pocket Wi-Fi depends on your setup and travel style. From my experience, an eSIM is a better option – it's fast to activate, doesn't require hardware pickup or return, and works instantly on supported phones. Solo travelers and remote workers will appreciate the convenience and reliability.
However, pocket Wi-Fi still has its place, especially for families or friends sharing multiple devices or travelers using older phones that don't support eSIM. Though it offers strong coverage and shared data, prepare to carry it around your trip and return it afterward. In 2025, eSIMs stand out as the more streamlined, modern solutions – that's ideal for most travelers who value ease, speed, and minimal gear.
Why Saily eSIM is a better travel solution for Japan
Whether you’ll be exploring the bustling streets of Tokyo or soaking in hot springs in Osaka, Saily will be a reliable travel companion. It’s convenient, easy to use, and flexible right from the start. Here’s what makes it my top choice:
- Effortless setup. Like all eSIMs, Saily is entirely digital, so you won’t need a physical SIM. Simply download the Saily app and follow the provider’s instructions.
- Multiple data plans. Saily has 6 data plans for Japan, varying in plan duration and data usage. So, you can pick a plan based on your trip length and data needs.
- Smooth app experience. Once you install the Saily app, you won’t have to wander elsewhere to manage your data. You can choose a different plan or network or get support anytime via the app.
- Ideal for Japan. Saily offers a broad coverage in Japan, extending from Tokyo to Kyoto and Osaka. Plus, you can get a plan for as little as $3.79/GB for 7 days.
Looking at its benefits, I believe that it’s a reliable alternative to pocket Wi-Fi. With Saily, you won’t have to worry about carrying around an extra device or the hassle of returning it after your trip.
Saily security features
The last thing you want on your trip is to run out of data because some sites use too many trackers or ads – or worse, land on a malicious website. Fortunately, Saily has built-in security tools for safer browsing while traveling:
- Virtual location lets you instantly shift your virtual location. Pick from 115+ global spots, browse with more privacy, and enjoy your home content anywhere.
- Ad blocker lets you browse without annoying ads or distractions, helping you save mobile data and speed up your browsing experience.
- Web protection shields you from internet threats by blocking malicious websites and limiting online trackers, helping you browse more securely.
eSIM vs pocket Wi-Fi for Japan: final thoughts
eSIMs and pocket Wi-Fi are two reliable ways to stay connected in Japan. However, if you’re looking for a more affordable, flexible, and travel-friendly solution, eSIM would better fit your travel needs. Still, pocket Wi-Fi may be useful for families, friend groups, or travelers with older phones that don’t support eSIM.
I recommend downloading and setting up your eSIM before landing in Japan. eSIMs like Saily activate automatically upon arrival in the country – even without an internet connection. Plus, they’re a reliable choice and ideal for travelers who want simple yet secure connectivity in Japan. Also, don’t write off pocket Wi-Fi – it can be your backup option.
Is it better to use eSIM or pocket Wi-Fi in Japan?
If you’re traveling to Japan, I recommend using an eSIM instead of pocket Wi-Fi. You can install it before your trip, and it will automatically activate upon arrival. Moreover, you won’t have to carry around an extra device and can receive support anytime you need it.
Do I need pocket Wi-Fi if I have eSIM?
No, you don’t need pocket Wi-Fi if you have an eSIM. However, you can use it as a backup option for older phones that don’t support eSIM or heavy shared data needs, like if you have a family with tablets or laptops.
Can I use eSIM as a hotspot in Japan?
Yes, you can share your internet connection with other devices or people by using the hotspot feature. However, keep in mind that using your eSIM to hotspot other devices will slow down your internet connection.
What are the disadvantages of pocket Wi-Fi?
Pocket Wi-Fi requires extra hardware and a portable battery, as it only lasts 6-15 hours. Moreover, if you lose or damage it, you might have to pay additional fees. Pocket Wi-Fi is also less flexible than eSIM since you can’t easily switch devices, plans, and networks.
How much does pocket Wi-Fi cost in Japan?
Typically, pocket Wi-Fi providers charge based on daily rates, averaging $4.10 per day in Japan. However, these plans usually offer unlimited data.
