What is Japan eSIM? A Comprehensive Explanation of Benefits, Usage, and Recommended Plans
Japan eSIM (eSIM Japan) is a digital SIM that allows you to use mobile data communication in Japan without having to swap out a physical SIM card.
You can add a communication plan to compatible iPhones or Android devices and set it up using a QR code that you receive after purchase. Since there is no need to pick up a SIM card at the airport or store, it is a convenient communication method for travel to Japan, overseas business trips, temporary returns, and short stays.
After arriving in Japan, you can use the internet for various purposes such as map applications, translation, transfer searches, ride-hailing services, social media, email, and video streaming.
This article clearly explains the mechanism of Japan eSIM, its benefits, setup method, how to choose a plan, necessary data capacity, points to note during use, and how to deal with connectivity issues.
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What is Japan eSIM?
eSIM stands for "Embedded SIM," which is a system that allows you to add a communication plan to the SIM functionality built into your smartphone.
Unlike traditional physical SIM cards, there is no need to remove or swap out a small card from the device.
Typically, Japan travel eSIMs are purchased online, and you set them up by scanning a QR code that arrives via email. If you install it before departure, you can turn on the target line and start communication after arriving in Japan.
For basic information about eSIM, please refer to What is eSIM? Basic Knowledge to Know Before Traveling Abroad.
Communication Methods Available During Travel in Japan
There are mainly four ways to use the internet on your smartphone while traveling in Japan:
- Japan travel eSIM
- Prepaid SIM card
- Rental Wi-Fi
- Overseas roaming from your current carrier
| Comparison Item | Japan eSIM | Physical SIM Card | Rental Wi-Fi | Overseas Roaming |
|---|---|---|---|---|
| Preparation Method | Purchase and set up online | Purchase in advance or in Japan | Pre-booking and pickup | Check with your current carrier |
| SIM Card Exchange | Not required | Required | Not required | Not required |
| What to Carry | Smartphone only | Smartphone only | Router and charger | Smartphone only |
| Pickup and Return | Not required | Received at purchase | Required | Not required |
| Sharing with Multiple People | Possible only with tethering | Possible only with tethering | Easy to share | Depends on the contract |
| Best for | Those who want to prepare before traveling | Those using devices that do not support eSIM | Those who want to share with multiple people | Those who want to use their regular line |
Japan eSIM is characterized by the ease of preparation online without the need for SIM card exchanges or picking up a Wi-Fi router.
On the other hand, if your smartphone does not support eSIM, you will need to consider using a physical SIM card or rental Wi-Fi.
Benefits of Japan eSIM
No Need to Swap SIM Cards
Japan eSIM allows you to add a communication plan to your smartphone internally.
Since you do not need to remove your regular physical SIM card, you reduce the risk of losing a small SIM card during your trip.
Can Be Prepared Online Before Departure
Japan eSIM can be purchased online and set up using a QR code.
If you install it before departure, you can avoid the hassle of searching for a SIM card booth or waiting in line for purchase procedures after arriving at a Japanese airport.
No Need for Pickup or Return at the Airport
Unlike rental Wi-Fi, there is no need to pick up a device at the airport or return it upon returning home.
Since you can communicate with just your smartphone, it is also suitable for those who do not want to carry extra luggage.
Easy to Set Up Immediately After Purchase
If the plan issues a QR code after purchase, you can proceed with the setup without waiting for delivery.
However, the timing of QR code issuance and conditions for starting use may vary by product, so please check before purchasing.
Easy to Choose Based on Travel Days and Data Capacity
Japan eSIM offers various options, including daily plans, multi-day plans, large capacity plans, and unlimited types.
This makes it easy to choose according to your stay style, whether for short trips, long stays, business trips, or temporary returns.
Easy to Use in Major Cities and Tourist Areas in Japan
Within the supported areas, you can use data communication in various places across Japan, including Tokyo, Osaka, Kyoto, Fukuoka, Sapporo, Nagoya, and Okinawa.
However, the communication situation may vary depending on the local network, buildings, underground areas, mountainous regions, and congestion.
Can Be Used as a Dual SIM
On dual SIM compatible devices, you may be able to add Japan eSIM while keeping your regular main line.
You can separate usage, such as using the main line for calls and SMS, and Japan eSIM for mobile data communication.
However, to prevent unintended charges from overseas roaming on the main line, please ensure that Japan eSIM is selected for mobile data communication.
Reasons to Recommend Japan eSIM for Travel
Check Maps Immediately After Arriving at the Airport
After arriving at a Japanese airport, you will use trains, subways, buses, or taxis to move to your hotel.
If you have internet access, you can check routes, transfers, travel times, and hotel locations using Google Maps or similar services.
Check Train and Subway Transfers
In urban areas of Japan, there are multiple railway companies and subway lines, which can feel complex for first-time visitors.
Using transfer guides and map applications makes it easier to check routes, station names, platforms, and exits.
Use Translation Apps
Translation apps and image translation can be helpful when checking restaurant menus, station signs, and product descriptions.
By ensuring you have internet access while out, you can use translation features immediately when needed.
Search for Tourist Spots and Restaurants on the Spot
If you change your plans during your trip, you can search for nearby tourist spots, cafes, restaurants, and shopping facilities.
You can check business hours, reviews, closed days, reservation status, and routes from your current location, making it easier to act.
Stay in Touch with Family and Friends
You can use apps like LINE, WhatsApp, and Messenger to message or call family and friends during your trip.
However, with a data-only eSIM, you cannot use regular phone numbers for calls or SMS.
Easy to Use for Business Trips or Temporary Returns
Japan eSIM can be used not only for sightseeing trips but also for overseas business trips, temporary returns, study preparations, and short stays.
If you plan to check emails, use business chat, attend online meetings, or tether, choose a plan with ample data capacity.
Who Should Use Japan eSIM
- Those who want to use the internet immediately after arriving in Japan
- Those who do not want to purchase a SIM card at the airport
- Those who do not want to carry a Wi-Fi router
- Those who do not want to remove their regular SIM card
- Those who frequently use Google Maps or transfer guides
- Those who want to post photos and videos on social media
- Those planning a business trip or temporary return to Japan
- Those who want to prepare their communication environment before departure
If your smartphone does not support eSIM, please consider using a physical SIM card or rental Wi-Fi.
Things to Check Before Using Japan eSIM
- Is the device you will use compatible with eSIM?
- Is the SIM lock removed?
- Is Japan included in the supported countries for the plan?
- Do the travel days match the available days of use?
- Is the necessary data capacity included?
- Have you confirmed the timing for starting use?
- Can you access the QR code?
- Is there a stable Wi-Fi environment?
- Is data roaming or APN settings required?
- Is tethering supported?
Check for eSIM-Compatible Devices
Not all iPhones and Android devices are compatible with eSIM.
Even with the same model name, eSIM may not be available depending on the country of sale, carrier, and model number.
Before purchasing, please check the list of eSIM-compatible devices for the smartphone you plan to use.
Check the SIM Lock Status
Devices with a SIM lock may not be able to use Japan travel eSIM.
Check the SIM lock status from the device's settings or the My Page of your carrier.
Check the Conditions for Starting Use
The timing for starting to use eSIM varies by product.
- Plans that start the usage period from the time eSIM is installed
- Plans that start when connected to the local network in Japan
- Plans that become valid from a specified start date
Before setting up, please check the product page or the instructions received after purchase for the conditions for starting use.
How to Set Up Japan eSIM
Japan travel eSIM is generally set up in the following steps.
- Select a Japan eSIM plan
- Check the travel days and data capacity, then purchase
- Check the QR code received via email
- Add eSIM from the smartphone settings
- Scan the QR code
- Give the added eSIM a recognizable name
- Turn on the Japan eSIM line after arriving in Japan
- Select Japan eSIM for mobile data communication
- Turn on data roaming if necessary
- Turn off Wi-Fi and check the connection
For detailed operation methods, please refer to the eSIM Setup Guide.
Add eSIM Before Departure
A stable internet connection is required to download eSIM.
Since you may not be able to connect to the airport Wi-Fi after arriving in Japan, it is advisable to set it up in a stable Wi-Fi environment at home before departure.
Display the QR Code on a Different Screen
If the QR code is displayed on the same smartphone, the camera on that device cannot scan it.
Display the QR code on a computer, tablet, or another smartphone, or print it out for scanning.
Turn on the Line After Arriving in Japan
After arriving in Japan, turn on the added Japan eSIM line and set Japan eSIM for mobile data communication.
Depending on the plan, you may need to turn on data roaming.
Basic Settings for iPhone
- Open "Settings"
- Select "Cellular"
- Choose "Add eSIM"
- Select "Use QR Code"
- Scan the QR code
- Select Japan eSIM for mobile data communication
- Turn on data roaming for Japan eSIM
Basic Settings for Android
- Open "Settings"
- Select "Network & Internet," "Connections," "SIM," etc.
- Select "Add SIM" or "Add eSIM"
- Scan the QR code
- Select Japan eSIM for mobile data communication
- Turn on data roaming for Japan eSIM
- Set up APN if necessary
On Android, menu names may vary by manufacturer and OS, such as Google Pixel, Samsung Galaxy, AQUOS, and Xperia.
How to Choose a Japan eSIM Plan
Choose Based on Travel Days
When selecting a Japan eSIM, it is essential to choose a plan that allows communication from the arrival date to the return date.
Since you will also use your smartphone on travel days, count the travel days accurately when selecting.
Choose Based on Data Capacity
The necessary data capacity varies depending on how you plan to use your smartphone during your trip.
| Main Usage | Data Consumption Trend | Considerations for Choosing a Plan |
|---|---|---|
| LINE & Email | Relatively low | If communication is the focus, consider a low capacity |
| Google Maps & Transfer Searches | Low to moderate | If used daily, allow for some extra capacity |
| Web Searches & Translation | Relatively low | For typical sightseeing use, large capacity is unlikely to be consumed |
| Viewing SNS | Moderate | Images and short videos consume data |
| Posting Photos & Videos | Moderate to high | If posting frequently, consider a large capacity |
| Video Streaming | High | If watching frequently, consider a large capacity or unlimited plan |
| Online Meetings | High | For business use, choose a plan with ample capacity |
| Tethering | Varies based on usage | Consider a large capacity when using a computer |
For detailed guidelines, please refer to Estimated Data Usage.
For Short Trips, Choose a Plan That Matches the Days
For short trips lasting a few days, it is easy to choose a daily plan that matches your stay.
If your main usage is maps, transportation searches, translations, and messaging, you may not need to choose an excessively large capacity.
If Using SNS or Videos, Consider a Large Capacity Plan
If you frequently use Instagram, TikTok, YouTube, etc., your data consumption will be high.
If you post many photos and videos, consider a plan with ample capacity.
For Video Streaming or Tethering, Consider Unlimited Types
If you plan to use video streaming, online meetings, or tethering to a computer, unlimited types or large capacity plans are good options.
However, even with unlimited plans, speed restrictions may apply after exceeding a certain amount. Please check the conditions for high-speed data communication and communication limits.
For Business Trips or Temporary Returns, Choose Based on Usage
During business trips, you may use email, chat, cloud documents, online meetings, and tethering.
For temporary returns, the stay may be longer, so check both the number of days of use and total data capacity.
If you want to compare plans, please check Japan eSIM Pricing and Plan Comparison.
Can You Use a Phone Number or SMS with Japan eSIM?
Typical Japan travel eSIMs are data-only plans.
With a data-only eSIM, you cannot make or receive calls or send and receive SMS using a regular phone number.
However, you can use the following services that utilize data communication:
- LINE messaging and calls
- WhatsApp messaging and calls
- App calls like Messenger
- SNS
- Web conferencing
If you need a Japanese phone number, regular voice calls, or SMS, please check the details of eSIM with a phone number.
Even with a plan that includes a phone number, it may not support all outgoing calls, incoming calls, SMS sending, and SMS receiving.
Points to Note When Using Japan eSIM
QR Codes May Not Be Reusable
The eSIM QR code may only be usable once.
Be careful not to select the wrong device for setup, and do not delete the eSIM during your trip after installation.
You May Be Out of Service Until Connecting to the Local Network in Japan
If you set up Japan eSIM outside of Japan, you may see "Out of Service" or "No Service" because you cannot connect to the corresponding local network.
After arriving in Japan, turn on the line and check mobile data communication and data roaming.
Be Cautious of Overseas Communication Charges from the Main Line in Japan
If you keep your regular main line on a dual SIM device, mobile data communication may switch to the main line.
To prevent unintended overseas roaming charges, ensure that Japan eSIM is selected for mobile data communication and turn off automatic switching of data communication if necessary.
Communication Conditions Vary by Location
Communication conditions may vary depending on the network used, time of day, buildings, underground areas, congestion, and mountainous regions.
During high-speed travel on shinkansen or trains, in subways, deep inside buildings, in mountainous areas, or on remote islands, communication may temporarily become unstable.
Check Tethering Based on the Plan
Whether tethering is possible with Japan eSIM depends on the plan and the device used.
If you plan to connect a computer or tablet, please check the product page before purchasing.
If Japan eSIM Does Not Connect After Arrival
If you cannot connect after arriving in Japan, please check the following items in order before deleting the eSIM.
- Turn off Wi-Fi and check mobile communication
- Check if the Japan eSIM line is turned on
- Check if Japan eSIM is selected for mobile data communication
- Turn on data roaming for Japan eSIM
- Turn on airplane mode and then turn it off
- Restart your smartphone
- Check if APN settings are required
- Set network selection to automatic
- Check the start date and validity period
- Check if you have exhausted your data capacity
Check the eSIM Line and Mobile Data Communication
Even if you have installed the eSIM, the line may be turned off.
Check if the added Japan eSIM line is turned on and if Japan eSIM is selected for mobile data communication.
Check Data Roaming
With travel eSIMs, you may not be able to communicate unless data roaming is turned on.
Make sure to turn on data roaming for Japan eSIM, not the main line.
Check APN Settings
Depending on the plan and Android device, you may need to set the APN manually.
If the APN information is included in the instructions after purchase, check for any mistakes in the input.
Contact Support Without Deleting the eSIM
If the issue persists after checking the settings, please contact support without deleting the eSIM.
Preparing the following information before contacting will make it easier to explain the situation:
- Order number
- Name of the device you are using
- OS version
- Current location
- eSIM settings screen
- Mobile data communication settings screen
- Data roaming settings screen
- APN settings screen
- Error messages displayed
For detailed confirmation methods, please refer to How to Deal with Japan eSIM Connectivity Issues.
You can check the contact information for setup inquiries at Japan eSIM Support.
Frequently Asked Questions About Japan eSIM
When Should I Set Up Japan eSIM?
It is recommended to complete the addition of eSIM before departure in a stable Wi-Fi environment.
However, some products may start the usage period from the time of installation, so please check the conditions for the plan you purchased.
Can I Use It Immediately After Arriving in Japan?
If you complete the addition of eSIM before departure and correctly set the Japan eSIM line, mobile data communication, and data roaming after arriving in Japan, you can use it after connecting to the local network.
How Long Does It Take to Set Up Japan eSIM?
It varies depending on the device and communication environment, but generally, it can be set up in a few minutes to about 10 minutes.
Setting it up in a stable Wi-Fi environment will make it smoother.
Do I Need to Swap SIM Cards?
No, you do not need to. You can use it without swapping out your physical SIM card, as you are adding a communication plan to an eSIM-compatible device.
Can I Use It on Both iPhone and Android?
It can be used on eSIM-compatible iPhones and Android devices.
Even with the same model name, compatibility may vary by country of sale and model, so please check the list of eSIM-compatible devices.
Can I Use It Throughout Japan?
You can use it within the supported networks and areas of the plan.
However, communication conditions may change in mountainous areas, underground, deep inside buildings, on remote islands, and during high-speed travel.
Does Japan eSIM Come with a Phone Number?
Typical Japan travel eSIMs are data-only and do not come with a regular phone number.
If you need a phone number or SMS, please check the details of eSIM with a phone number.
Can I Use Tethering with Japan eSIM?
Whether tethering is possible depends on the plan and device.
If you plan to connect a computer or tablet, please check the compatibility before purchasing.
What Happens If I Accidentally Delete Japan eSIM?
You may not be able to reinstall it with the same QR code.
If you accidentally delete it, please check with support to see if a new QR code can be issued.
What Should I Do If I Cannot Connect?
Check the Japan eSIM line, mobile data communication, data roaming, APN settings, airplane mode, and restart the device.
For more details, please refer to How to Deal with Japan eSIM Connectivity Issues.
Conclusion | Prepare eSIM Before Traveling to Japan
Japan eSIM is a convenient communication method that allows you to use the internet in Japan without swapping out a physical SIM card.
Since you can purchase and set it up online, there is no need to pick up a SIM card at the airport, making it easy to use maps, transfer guides, translations, social media, and email immediately after arriving in Japan.
Before purchasing, please check the following points:
- Is the device you will use compatible with eSIM?
- Is the SIM lock removed?
- Do the travel days match the plan's validity period?
- Is the necessary data capacity included?
- When does the usage period start?
- Is data roaming or APN settings required?
- Do you need a phone number or SMS?
- Is tethering supported?
JAPAN&GLOBAL eSIM offers Japan eSIM plans that can be used for travel to Japan, overseas business trips, and temporary returns.
Check your travel days and smartphone usage, and choose the Japan eSIM plan that suits you best.
