World eSIM is a completely prepaid, contract-free Japan travel eSIM service, perfect for visitors to Japan.
In this article, we’ll give a complete review of World eSIM—one of the most popular prepaid eSIM for Japan options—operated by a leading Japanese company. Based on real customer reviews, we’ll cover all the pros and cons so you can decide if this is the best eSIM for Japan travel.
Advantages of World eSIM
- ● Available for purchase 24/7, so you can activate your Japan travel eSIM and get online immediately upon arrival
- ● Operated by a major Japanese telecom company that has been the country’s No.1 overseas rental WiFi provider for 7 consecutive years
- ● Offers a variety of eSIM plans for Japan travel, including Unlimited Data, Day Pass, and Fixed Data packages
Disadvantages of World eSIM
- ● Cannot be used on devices that are not eSIM-compatible or not SIM-free (unlocked)
- ● This is a data-only Japan travel eSIM, so it does not come with a phone number
- ● No 24-hour real-time customer support is available for this prepaid eSIM for Japan
\ Available for online purchase 24/7 /
If you’re planning a trip to Japan, consider using World eSIM’s prepaid eSIM for Japan for a fast, reliable, and hassle-free mobile internet experience during your stay.
Koki Abe
eSIM Portal Administrator
- Operates travel eSIM store for international travelers
- 8 years of sales experience in telecommunications (mobile, fiber optic)
- Backpacker who traveled to 16 countries worldwide
- Shares insights on eSIM benefits discovered during travels
Contents
- 1 World eSIM: Key Facts for Japan Travel
- 2 Positive Reviews & User Feedback for World eSIM
- 3 Negative Reviews & Potential Drawbacks of World eSIM
- 4 Comparison: World eSIM vs Other eSIM Services
- 5 Advantages of World eSIM
- 6 Disadvantages of World eSIM
- 7 Testing World eSIM’s Data Speed in Japan
- 8 How to Use World eSIM
- 9 Frequently Asked Questions
- 9.1 What should I be careful about when using World eSIM?
- 9.2 How many days in advance should I apply for World eSIM?
- 9.3 Are there any coupon codes available?
- 9.4 Can I use hotspot?
- 9.5 What happens when I reach the data limit?
- 9.6 Is it okay to keep my regular SIM card inserted?
- 9.7 What's the difference between eSIM, rental Wi-Fi, and international roaming?
- 9.8 What is dual connection with eSIM and domestic SIM card?
- 10 Summary
World eSIM: Key Facts for Japan Travel
(Image source: World eSIM official site) |
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| Number of supported countries | 200+ |
| Network operator (Japan) | SoftBank |
| Lowest-priced plan | 3GB / 7days / 6.90 JPY |
| Tethering | ◯ |
| Contact method | Email form |
| Business hours | Open daily: 9:00–18:00 (JST) |
| Operator / Location | Vision Inc. (Japan) |
World eSIM is a prepaid eSIM service that lets you connect to mobile data via roaming in 200+ countries, including Japan.
Depending on the data plan, the lowest cost starts around ¥370 per day—often cheaper than rental pocket Wi-Fi in Japan (typically ¥700–¥900 per day), making it a great value prepaid eSIM for Japan travel.
One-time purchase, covers 200+ countries — a reliable travel eSIM
World eSIM is a prepaid eSIM for international travel: choose a data plan for the exact number of days you’ll be in your destination and pay upfront.
Because it’s pay-as-you-go, you won’t face unexpected roaming charges. No contract, no cancellation fees, and no activation fees—ideal if you’re looking for the best eSIM for Japan with simple terms.
After purchase, there’s no need for rental pocket Wi-Fi or a physical SIM card—just install the eSIM profile※ and your phone can get online abroad.
※ A data profile that enables mobile data on your smartphone.
Compared with carrying a rental Wi-Fi unit or handling a removable SIM card, a Japan travel eSIM is quicker and simpler to set up on arrival.
Operated by Vision Inc., a Tokyo Stock Exchange Prime–listed company
World eSIM is provided by Vision Inc., which has been listed on the Tokyo Stock Exchange Prime market since 2015.
| Company operating World eSIM | |
| Company name | Vision Inc. |
| Stock market | TSE Prime (Tokyo) |
| Founded | June 1, 1995 |
| Capital | ¥2,571,600,000 (as of Dec 31, 2023) |
| Employees | Japan: 803 Overseas: 93 (as of Dec 2023) |
| Main businesses | • Global WiFi • Information & communications services • Glamping & tourism |
| Headquarters | Shinjuku Eastside Square 8F, 6-27-30 Shinjuku, Shinjuku-ku, Tokyo |
Vision has long specialized in connectivity for travelers. Its Global WiFi rental service—primarily for the Japanese market—has been used by over 19 million users in Japan.
Leveraging the know-how accumulated since Global WiFi launched in 2012, Vision introduced World eSIM in 2021.
Because World eSIM is operated by an established Japanese telecom provider, it’s a highly trustworthy choice for a Japan travel eSIM.
\ 24/7 online purchase available on the special site /
Positive Reviews & User Feedback for World eSIM
Let’s take a look at actual positive reviews and ratings from real users of World eSIM.
If you’re considering purchasing World eSIM, the following real-life experiences—collected from our independent research and posts on X (formerly Twitter)—will give you useful insights.
Positive Reviews of World eSIM
First, let’s check out the positive reviews and ratings for World eSIM.
Able to choose an affordable plan that suits your needs before traveling
You can purchase and set up the eSIM before you travel, and buying a physical SIM at an airport can be more expensive. With World eSIM, you can customize the plan based on your travel days and data allowance, which keeps costs low.
Because you can prepare the eSIM before your trip, it’s especially convenient when things get hectic during international travel.
Convenient multi-country plans including Japan
When I traveled to Europe in fall 2024, I used an eSIM for internet access. My route was Tokyo → Singapore (layover) → Netherlands (layover) → Luxembourg → London, so I chose the World eSIM multi-country plan that included Japan to avoid any setup issues during short layovers. It worked really well.
(Source: X)
Multi-country plans are convenient because, if your destinations are within the supported coverage (including Japan), you don’t need to repurchase or reinstall the eSIM—one plan covers your entire trip.
Some of the lowest prices depending on the country
I’m a cost-performance enthusiast and constantly research “the cheapest and best option,” and for my short stay in New Zealand, World eSIM seemed like the best choice ☀️🐏.
Come to think of it, I also used it in Thailand recently—affordable and convenient. I only used it a little at the end of my trip, but I recall the connection being pretty good.
(Source: X)
World eSIM offers affordable data plans in many countries, with options such as “Unlimited,” “Day Pass,” and “Fixed Data.”
Negative Reviews & Potential Drawbacks of World eSIM
Next, let’s look at some of the negative reviews reported by actual users of World eSIM.
Negative Reviews of World eSIM
Not working in Japan when connected via China Mobile?
I purchased a Japan plan with World eSIM, but when I activated it, it connected to China Mobile and showed “No Service.” Obviously, I would prefer it to connect through a Japanese provider.
(Source: X)
Some packages use the China Mobile (CMLink) APN, but in Japan it will roam onto the SoftBank network, so it should work without issue. However, certain Japan-only streaming or web services may not be accessible.
Not truly unlimited data?
The “unlimited” plan from World eSIM isn’t truly unlimited—if you receive a large email attachment, the data stops. I’d recommend a different provider if you need a convenient eSIM.
That said, Global WiFi service is fine!
(Source: X)
Even if a plan is labeled “unlimited,” there may be a daily data cap, so it’s important to check the details before purchase.
High prices in some countries
Is there even a country where this doesn’t work?
By the way, since this is World eSIM, the cost-performance isn’t great compared to cheap local eSIMs—Vietnam was the same.
(Source: X)
If you find the price high in certain countries outside Japan, it’s worth comparing with other local eSIM providers.
\ 24/7 online purchase available on the special site /
If you’ve reviewed these World eSIM pros and cons and would like to compare with other Japan travel eSIM options, check out the article below—you’re sure to find an eSIM that fits your needs.
Also Check
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Best eSIMs for Japan Travel in 2025 – Honest Comparison & Top Picks
Best eSIMs for Japan Travel in 2025 – Honest Comparison & Top Picks Planning a trip to Ja ...
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Comparison: World eSIM vs Other eSIM Services
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| World eSIM
|
JapanConnect eSIM
|
Holafly
|
airalo
|
|
| Coverage Countries | ~200 countries | ~133 countries | ~200 countries | ~200 countries |
| Japan Network Carriers | SOFTBANK | DOCOMO(IIJ)/ KDDI・SOFTBANK |
KDDI・SOFTBANK | KDDI・SOFTBANK |
| Recommended Duration | 1-30 days | 3-30 days | 1-60 days | 1-30 days |
| Recommended Data | 500MB-3GB | 3-50GB/ Unlimited |
Unlimited | 1-20GB |
| Support Type | Email/LINE | Live Chat | Live Chat | |
| Support Hours | 9:00-18:00 (Year-round) |
9:00-18:00 (Year-round) |
24/7 | 24/7 |
| Tethering | ◯ | ◯ | △ | ◯ |
| Dedicated App | 〇 | × | 〇 | 〇 |
| Headquarters Location | Japan | Japan | Ireland | Singapore |
World eSIM is an eSIM service provided by a publicly listed Japanese company, offering an easy-to-use app.
However, compared to other eSIM providers that offer real-time chat or LINE support, it may take slightly longer to receive a response from customer support.
Its data packages range from small to large allowances, including unlimited options, but the small data plans are especially affordable and recommended.
Next, let’s take a look at World eSIM’s pricing plans by region!
Advantages of World eSIM
Let’s explore the benefits of World eSIM based on user reviews, ratings, and comparisons with other eSIM providers.
Advantages of World eSIM
Fully remote ordering via the official website
With World eSIM, you can easily order your eSIM data plan from the Japanese-language official website.
Everything is completed online without face-to-face contact, and you can purchase from anywhere with an internet connection—so even if you need to travel abroad on short notice, there’s no need to panic.
Unlike rental pocket Wi-Fi or physical SIM cards, you don’t need to search for a sales counter or deal with in-person pick-up or postal returns, making it a much more convenient option.
Travel preparation can get hectic, and arranging mobile connectivity abroad is often a hassle. With World eSIM, you can set up your phone for overseas use stress-free, anytime and anywhere—from home or at the airport.
Available in 200 countries with industry-leading coverage for multi-country plans
Multi-country plans are available for regions such as Asia (22 or 33 countries, including Japan), Europe (51 countries, excluding Japan), and worldwide coverage (53 or 140 countries) with a single eSIM.
Since you don’t need to purchase a new plan for each country, these are especially convenient for multi-destination trips.
Below is a ranking of major eSIM providers by the number of supported countries:
| Plan Type | Number of Supported Countries |
| Single-country plans | Airalo (approx. 200) Ubigi (approx. 200) World eSIM (approx. 200) Holafly (approx. 200) |
| Asia regional plans | 1st: World eSIM (33 countries)*1 2nd: Airalo (18 countries) 3rd: Ubigi (14 countries) 4th: Holafly (12 countries) |
| Europe regional plans | 1st: World eSIM (51 countries) 2nrd: Airalo (39 countries) 3rd: Holafly (35 countries) 4th: Ubigi (33 countries) |
*1 Asia & Oceania Plan B. Plan A covers 22 countries.
Airalo and Ubigi lead in total country coverage, but World eSIM offers the most destinations for multi-country plans.
With eSIM providers that have fewer supported countries, you may find that your intended destination isn’t covered.
By contrast, World eSIM supports over 200 countries worldwide, and with multi-country plans, you can travel across borders without having to switch plans.
These stress-free multi-country plans are ideal for anyone visiting two or more countries on a single trip!
Reliable customer support from a publicly listed company
World eSIM is operated by Vision Inc., a major Japanese company that has been providing travel connectivity services for over 20 years.
While eSIM technology itself is relatively new (World eSIM launched in 2021), Vision Inc. brings extensive customer service experience from its GLOBAL WiFi operations.
As a result, World eSIM’s customer support is highly reliable, allowing you to use your phone in Japan with confidence.
Support is available daily from 9:00 to 18:00 Japan time, making it a safe choice even for first-time eSIM users or those who aren’t confident with smartphone setup.
| World eSIM Customer Support | |
| Contact method | Email form |
| Business hours | Open daily: 9:00–18:00 (JST) |
Disadvantages of World eSIM
Next, let’s go over the drawbacks of World eSIM. The main disadvantages are as follows:
Disadvantages of World eSIM
Requires an eSIM-compatible device
World eSIM cannot be used if your smartphone is not eSIM-compatible.
This isn’t a drawback unique to World eSIM, but rather a common point of caution for all eSIM services, as eSIM is still a relatively new technology.
Always check whether your device supports eSIM before purchase. You can find a detailed list of compatible devices in the guide linked below.
Japan travel packages do not include a phone number
The Japan travel eSIM plans from World eSIM are data-only. They do not come with a Japanese phone number or SMS capability.
In Japan, eSIMs with local phone numbers from major carriers require a contract screening process, and prepaid options rarely include voice or SMS service.
You can, however, keep your home country’s SIM card in your phone while using the eSIM. If your device supports dual SIM, you can still make voice calls or receive SMS using your regular SIM—international rates will apply.
Account registration is required to purchase
To purchase an eSIM data plan from World eSIM, you need to register for an account. When using the app, you must also log in before buying a plan for the first time.
However, registration only requires your name, email address, and password. Once logged in, you can easily check your remaining data or purchase top-ups directly from the app.
\ Purchase online 24/7! /
Testing World eSIM’s Data Speed in Japan
Many travelers may wonder whether World eSIM offers fast enough data speeds for comfortable use in Japan.
The table below shows the results of four speed tests we conducted in Japan using World eSIM’s Japan data plan:
| World eSIM Measured Speeds* |
Average Speed |
Test 1 (9:36 AM) |
Test 2 (10:57 AM) |
Test 3 (1:24 PM) |
Test 4 (6:29 PM) |
| Download*1 | 32.3 Mbps | 35.6 Mbps | 24.8 Mbps | 30.2 Mbps | 38.6 Mbps |
| Upload*2 | 13.37 Mbps | 8.20 Mbps | 11.7 Mbps | 5.41 Mbps | 28.2 Mbps |
* Tested May 2024 in Tokyo.
*1 Download speed.
*2 Upload speed.
In conclusion, World eSIM’s measured speeds are slightly slower than those of Japan’s major domestic carriers, but comparable to budget MVNO SIMs.
MVNO: Mobile Virtual Network Operator—a company that provides lower-cost mobile service by leasing network infrastructure from Japan’s three major carriers (NTT Docomo, au, SoftBank).
Because eSIMs rely on partner carriers’ data roaming, actual speeds can vary from country to country. The above results are for reference only.
How to Use World eSIM
How to Use World eSIM
Access the World eSIM Official Website
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| First, access the World eSIM official website. |
\ 24/7 online purchase available /
Select Your Preferred Data Plan for Your Destination Country
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| Select the plan for your travel destination. |
Register as Member and Make Purchase
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| For new purchases, register as a member, enter your credit card information, and purchase the data plan. |
Install (Activate) the eSIM
Install (activate) the purchased World eSIM. There are three main methods for installing eSIM:
| Activation Method |
Recommendation Level | Features |
| Direct Installation from App |
★★★ | ・Quick installation ・Possible with just one smartphone |
| Install with QR Code |
★★ | ・Quick installation ・Possible with one device for iPhone iOS17 and later ・For iPhone iOS16 and earlier, and Android, you need to display the QR code on another smartphone or print it in advance |
Jump to the installation method you want to check
Direct Installation from App to Device | iOS・Android Common
World eSIM installation from the app is most recommended because it's simple. For app installation, follow the steps from the World eSIM app.
The World eSIM app can be installed from the links below:
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| From the My eSIM tab, select the purchased eSIM data plan, then from eSIM installation, choose your smartphone OS. |
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| Move to the bottom of the screen and press Install. Allow the activation of new eSIM and continue with activation. (The image shows iPhone, but Android follows the same steps) |
Once eSIM installation is complete, preparation in the destination country is finished. After that, when you arrive locally, perform the eSIM switching procedure.
Install using QR Code with 2 smartphones | iPhone iOS16 and earlier
Press and hold the received QR code, then tap “Add eSIM.” |
Allow the Activate New eSIM. |
Install using QR Code with 2 smartphones | Android
Open the Settings app and tap "Network & Internet", then "Mobile Network" in order. |
Select "Download a SIM instead?" and tap "Next".Scan the QR code displayed on another device or printed with your smartphone. |
Switch to eSIM Data Roaming at the Japanese Airport
When you arrive at the Japanese airport, connect to the internet with World eSIM. For both iOS and Android, follow the steps below to turn on World eSIM mobile data connection and roaming.
To prevent high charges, make sure to turn off the mobile data connection of the SIM you normally use for your main line.
How to Switch to World eSIM Mobile Data on iPhone
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| "Mobile Data" → Select activated "World eSIM" → Turn on "Turn On This Line" and "Data Roaming" |
How to Switch to World eSIM Connection on Android
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| "Network & Internet" → Select "Mobile Network".Turn on the activated "World eSIM" and turn on Mobile Data and Roaming. |
Frequently Asked Questions
We answer frequently asked questions about World eSIM. Please take a look if you're considering World eSIM for your next trip to Japan.
Frequently Asked Questions
- What should I be careful about when using World eSIM?
- How many days in advance should I apply for World eSIM?
- Are there any coupon codes available?
- Can I use hotspot?
- What happens when I reach the data limit?
- Is it okay to keep my regular SIM card inserted?
- What's the difference between eSIM, rental Wi-Fi, and international roaming?
- What is dual connection with eSIM and SIM card?
What should I be careful about when using World eSIM?
The main precaution when using World eSIM is that it can only be used with eSIM-compatible devices. Also, please note that eSIM cancellation is not possible after purchase.
How many days in advance should I apply for World eSIM?
There is no application deadline for World eSIM. You can apply right before you start using it. The eSIM validity period is 30 days, so if you don't complete activation within 30 days, it will become unusable.
Are there any coupon codes available?
There are no coupon codes for World eSIM. However, if you apply through our site's exclusive special page, you can use all plans at 5% OFF.
Can I use hotspot?
World eSIM supports hotspot. However, if you use hotspot with a low-capacity data plan, your data allowance will be consumed quickly, and you'll reach the speed limit.
What happens when I reach the data limit?
World eSIM applies data restrictions when you reach the specified data capacity. When you reach the data limit, speeds are reduced to a maximum of 128kbps, but the service doesn't become completely unusable.
Is it okay to keep my regular SIM card inserted?
There's no problem keeping your regular SIM card inserted when installing or using World eSIM.
What's the difference between eSIM, rental Wi-Fi, and international roaming?
eSIM, rental WiFi, and international roaming differ in usage methods, pricing, and types/numbers of compatible devices, with different recommendations for different people.
What is dual connection with eSIM and domestic SIM card?
With iPhone and Android, dual standby (simultaneous use) of physical SIM and eSIM※ is possible.
※Limited to eSIM-compatible devices. Also, iPhone 13 and later models support dual SIM with eSIM-to-eSIM connections.
How to use SIM and eSIM simultaneously
- SMS, voice calls → SIM card inserted in SIM slot
- Mobile data communication → eSIM
As shown above, you can use SMS and mobile data communication simultaneously with separate SIM and eSIM.
Summary
Article Summary
- World eSIM is a prepaid eSIM for Japan travel supporting over 200 countries
- Provided by a Japanese company listed on the Tokyo Stock Exchange Prime Market, offering peace of mind
- Available for 24/7 online application from the official website
- Equipped with year-round customer support
- Cannot be used with devices that don't support eSIM
World eSIM allows you to choose a plan that suits you from a wide range of data plans for Japan, and from data purchase to service start takes only about 10 minutes, making it very convenient for data communication during Japan travel.
Please use World eSIM's prepaid eSIM for your Japan travel to enjoy convenient and reliable internet access.
\ Special website with 24/7 online purchase available /