During a trip to Japan, there are many situations where you will use your smartphone, such as Google Maps, train transfer guides, translation apps, and hotel reservation confirmations.
However, if you use your regular overseas SIM card in Japan, you may incur high roaming charges.
That's why we recommend the Japan eSIM, which can be purchased online before arriving in Japan.
With an eSIM, there is no need to receive or exchange a physical SIM card. If you install it on a compatible smartphone in advance, you can use the internet as soon as you arrive in Japan.
However, when choosing a Japan eSIM, you need to check the duration of your trip, data capacity, phone number, tethering, and when to start using it.
This article clearly explains how to choose a Japan eSIM for foreign visitors, how to purchase it online, how to scan the QR code, and how to set it up after arriving in Japan.
What is Japan eSIM?
An eSIM is a digital SIM embedded in the smartphone itself.
There is no need to insert a small card into the device like a traditional SIM card.
You can purchase a communication plan online and add it to your smartphone using a QR code or manual setup information.
If your device is compatible, you may be able to add a Japan eSIM while keeping your overseas SIM card.
Reasons Why Japan eSIM is Recommended for Foreign Visitors
Can be purchased before arriving in Japan
Japan eSIM can be purchased online.
If you complete the purchase and installation before departure, you won't need to look for a SIM card store or rental counter after arriving at the airport.
No need to pick it up at the airport
Physical SIMs or rental Wi-Fi need to be picked up at the airport, hotel, or store.
With eSIM, you can receive setup information via email, so you can prepare without waiting to pick up the product.
No need to swap physical SIMs
Since you don't need to remove the SIM card you use overseas, you can reduce the risk of losing it.
No need to return after the trip
Unlike rental Wi-Fi, you don't need to return it to the airport or a drop-off box before returning home.
After use, you can turn off the eSIM line.
Easy to connect as soon as you arrive in Japan
If you set it up before departure, you can easily start using the internet by just turning on the eSIM after arriving in Japan.
You can quickly check routes from the airport to your hotel, train transfer guides, and contact family.
Choose a plan that fits your travel duration
Japan eSIM offers various valid periods and data capacities, from short trips to long stays.
You can check the currently available products at Japan eSIM products and pricing plans.
Situations Where Japan eSIM is Useful for Visitors
- Check the route from the airport to the hotel
- Confirm train and bus transfer guides
- Search for tourist spots on Google Maps
- Check Japanese with a translation app
- Display hotel and flight reservation information
- Contact family via LINE or WhatsApp
- Make reservations for restaurants and tourist facilities
- Post photos and videos on social media
- Look up hospitals or transportation information in emergencies
Especially for first-time visitors to Japan, being able to use the internet anytime while on the move provides great peace of mind.
Comparison of Communication Methods Available for Travel in Japan
| Communication Method | Features | Best for |
|---|---|---|
| Japan eSIM | Online purchase, no need for pickup or return | Individual travelers using compatible devices |
| Prepaid SIM | Use by inserting a physical SIM into the device | Those using devices that do not support eSIM |
| Rental Wi-Fi | Can be shared among multiple people with a dedicated router | Family or group travel |
| Overseas Roaming | Use your regular SIM as is | Those who want easy setup for a short period |
| Free Wi-Fi | Available at hotels and facilities | Those who hardly use mobile data |
For solo travelers or those using a single smartphone, eSIM is convenient as it doesn't increase the number of devices to carry.
If multiple people are always traveling together and need to connect multiple devices, rental Wi-Fi is also an option.
How to Choose Japan eSIM for Foreign Visitors
Select a usage period that matches your travel duration
Choose a plan that includes all days from your arrival date in Japan to your departure date.
| Duration of Stay in Japan | Easy-to-choose Plan |
|---|---|
| 1-3 days | Short-term plan of about 3 days |
| 4-7 days | 5-day or 7-day plan |
| 8-14 days | 10-day or 15-day plan |
| 15-30 days | 30-day plan |
If there is a possibility of flight changes or extending your stay, it is advisable to choose a plan that is 1-2 days longer than planned for peace of mind.
Select the necessary data capacity
The necessary data capacity varies depending on how you use your smartphone during your trip.
| Usage Style | Daily Estimate | Main Uses |
|---|---|---|
| Light Use | About 300-500MB | Maps, transfer guides, messages |
| General Use | About 500MB-1GB | SNS, photo posting, searching, voice calls |
| Heavy Use | 1-3GB or more | Videos, video calls, tethering |
For detailed data usage, please check Estimated Data Usage.
Check if it is a fixed capacity type or a daily type
Japan eSIM comes in two types: one that uses a fixed capacity for the entire travel period and one that sets high-speed data capacity on a daily basis.
The fixed capacity type is suitable for those whose data usage varies by day.
The daily type is easier to manage for those who use their smartphone in a similar way every day.
Check the conditions for unlimited plans
Even if it is labeled as unlimited, there may be daily high-speed data limits or fair usage policies in place.
If you plan to watch videos or use tethering, please check the speed limit conditions.
Check if tethering is supported
If you want to connect a laptop or tablet, choose an eSIM that supports tethering.
Some products may not allow tethering or may have limits on the shared data capacity.
Check if additional charges are supported
In case you run out of data during your trip, check how to add additional charges or repurchase.
Check the coverage area
If you plan to visit not only urban areas but also rural areas, mountainous regions, or remote islands, please check the coverage area of the communication provider you will be using.
Check the support system
If you are unsure about the setup, check the contact methods, support hours, and available languages.
For inquiries about setup and connection, please refer to Japan eSIM Support.
Recommended Data Capacities by Travel Duration
1-3 Day Trip to Japan
If your focus is on maps, transfer guides, and messages, aim for about 1-3GB.
If you plan to use videos or video calls, consider 3-5GB or more.
5-7 Day Trip to Japan
For general use, 3-5GB is an easy capacity to choose.
If you use SNS, photo posting, and videos daily, having 5-10GB or more is reassuring.
10-14 Day Trip to Japan
If you regularly use maps, SNS, and searches, aim for about 5-10GB.
If you hardly use hotel Wi-Fi, consider 10-20GB or more.
15-30 Day Long Stay
For long stays, consider plans with 10-20GB or large capacity/unlimited plans.
If you plan to work remotely, have online meetings, or use tethering, please check the limits on high-speed data.
| Duration of Stay | Light Use | General Use | Video/Tethering |
|---|---|---|---|
| 1-3 days | About 1GB | 1-3GB | 3-5GB or more |
| 5-7 days | About 3GB | 3-5GB | 5-10GB or more |
| 10-14 days | About 5GB | 5-10GB | 10-20GB or more |
| 15-30 days | About 10GB | 10-20GB | Large capacity/unlimited |
You can check products by duration and capacity at Japan eSIM Pricing and Plan Comparison.
Things to Check Before Purchasing Japan eSIM
Is your smartphone compatible with eSIM?
Not all smartphones are compatible with eSIM.
Even with the same model name, compatibility may vary depending on the country of sale, model, and carrier.
Please check the device you plan to use at List of eSIM-Compatible Devices.
Is the SIM lock removed?
If your device has a SIM lock, you may not be able to add a Japan eSIM from another carrier.
Check the SIM lock status through your device settings or with your carrier.
Is there space to add an eSIM?
There is a limit to the number of eSIMs that can be stored on a smartphone and the number of lines that can be activated simultaneously.
If there are unnecessary lines, check if they can be reused before deleting them.
Can you use a stable Wi-Fi connection?
An internet connection is required to download and install the eSIM.
It is recommended to set it up in a stable Wi-Fi environment, such as at home before departure.
Do you have another device to display the QR code?
If you receive the QR code on the same smartphone, you may not be able to scan it directly with the camera.
Please display the QR code on a computer, tablet, or another smartphone, or use the manual setup information.
How to Purchase Japan eSIM
You can purchase Japan eSIM from an online shop.
The general purchase flow is as follows:
- Check if the smartphone you will use is eSIM compatible
- Confirm your arrival and departure dates in Japan
- Select a plan that matches your travel duration
- Select the necessary data capacity
- Check if tethering and phone number are included
- Enter your email address
- Make the payment online
- Check the purchase confirmation email and QR code
If you make a mistake in the email address you enter during purchase, you may not receive the QR code or setup information.
After completing your order, please check your spam folder as well.
When to Purchase Japan eSIM?
It is recommended to purchase it a few days before your departure to Japan.
By purchasing early, you can secure time to check the compatibility of your device and the setup method.
However, some products may require you to start using them within a certain period after purchase.
Please check the following items before purchasing:
- Validity period after purchase
- Installation deadline
- Whether you can specify a start date
- When the usage period starts
When to Set Up Japan eSIM?
Basically, it is recommended to install the eSIM before departure and activate the line after arriving in Japan.
If you set it up before departure, you can reduce the hassle of searching for the QR code or using airport Wi-Fi to set it up after arriving.
However, some products may start the usage period as soon as the eSIM is installed.
Be sure to check the usage start conditions before setting it up.
How to Set Up Japan eSIM on iPhone
- Connect to a stable Wi-Fi
- Open "Settings"
- Select "Cellular"
- Select "Add Cellular Plan"
- Select "Use QR Code"
- Scan the QR code received after purchase
- Follow the on-screen instructions to add the eSIM
- Change the line name to "Japan eSIM" or similar
- Keep the line OFF until you arrive in Japan
The names of the settings may vary depending on the iPhone model and iOS version.
How to Set Up Japan eSIM on Android
- Connect to a stable Wi-Fi
- Open "Settings"
- Select "Network & Internet" or "Connections"
- Select "SIM" or "SIM Manager"
- Select "Add eSIM"
- Scan the QR code
- Follow the on-screen instructions to add the eSIM
- Change the line name to "Japan eSIM" or similar
- Keep the line OFF until you arrive in Japan
Android settings may vary by manufacturer and model.
For detailed setup instructions, please refer to eSIM Setup Guide.
Settings to Perform After Arriving in Japan
Once you arrive in Japan, check the following settings.
- Open your smartphone settings
- Turn ON the Japan eSIM line
- Select Japan eSIM for mobile data
- Set up data roaming according to the product instructions
- Turn OFF data roaming for your main overseas line
- Turn OFF automatic switching of mobile data
- Turn OFF Wi-Fi and check the connection
If Google Maps and websites are displayed, the basic connection is complete.
Should Data Roaming be ON?
Some travel eSIMs have a mechanism for roaming connections to Japanese carriers.
In that case, you need to turn ON data roaming for the Japan eSIM.
However, please turn OFF data roaming for your main overseas line.
| Setting Item | Main Overseas Line | Japan eSIM |
|---|---|---|
| Line | ON if SMS is needed | ON |
| Mobile Data | Not used | Used |
| Data Roaming | OFF | Set according to product instructions |
| Automatic Data Switching | OFF | |
Can You Use Overseas SIM and Japan eSIM Simultaneously?
If you have a dual SIM compatible smartphone, you may be able to keep your overseas main line while using the Japan eSIM for data communication.
This allows you to receive SMS verification with your overseas phone number while using the Japan eSIM for data communication within Japan.
However, if you make or receive calls using your overseas main line or send SMS, you may incur overseas charges.
Please check the roaming charges with your carrier.
Can You Use Phone Calls and SMS with Japan eSIM?
Most general travel Japan eSIMs are data-only products and may not include a Japanese phone number or SMS functionality.
Even with a data-only eSIM, you can use the following internet services:
- LINE
- Messenger
- Skype
- Zoom
- Google Meet
On the other hand, if you want to make regular calls to Japanese phone numbers or use SMS verification in Japan, you will need a plan with a phone number.
For more details, please check eSIM with Phone Number.
Can You Use Tethering with Japan eSIM?
If the product and device support tethering, you can use your smartphone as a Wi-Fi router.
This is convenient for connecting laptops or tablets.
However, tethering may consume a lot of data.
Be cautious with OS updates, cloud syncing, and downloading large files on your computer.
What to Check If Japan eSIM is Not Connecting?
If you cannot connect after arriving in Japan, please check the following items.
- Is the Japan eSIM line ON?
- Is Japan eSIM selected for mobile data?
- Is data roaming ON if necessary?
- Is the APN set correctly?
- Is it the usage start date?
- Is there remaining data capacity?
- Is network selection set to automatic?
- Is the device's SIM lock removed?
After checking the settings, try turning ON airplane mode and then OFF, or restart your smartphone.
Even if you cannot connect, do not delete the eSIM immediately on your own judgment.
You may not be able to reuse the QR code and reinstall the same eSIM.
For detailed troubleshooting methods, please refer to Troubleshooting Japan eSIM Connection Issues.
How to Save Data Capacity During Your Trip to Japan
Use Hotel Wi-Fi
Watch videos, update apps, and back up photos while connected to hotel Wi-Fi.
Lower Video Quality
Setting the video quality low on YouTube or streaming services can help reduce data consumption.
Turn OFF Auto-Play for SNS Videos
Stopping auto-play for videos on Instagram or TikTok can save data.
Stop Automatic Backup for Photos and Videos
Automatic backups on iCloud or Google Photos can use a lot of data.
Save Offline Maps
Download maps of areas you plan to visit while connected to Wi-Fi to reduce data usage while moving.
Use Low Data Mode
Using low data mode on iPhone or data saver on Android can help reduce background data usage.
If You Run Out of Data Capacity
If your data capacity is running low, first check the remaining amount and expiration date on your account page.
If additional charges are supported, you can add data to your current eSIM.
If additional charges are not possible, connect to hotel or café Wi-Fi and purchase a new Japan eSIM.
When setting up the new eSIM, do not delete the currently used eSIM immediately; instead, turn off the line and keep it.
Points to Note for Foreign Visitors Using Japan eSIM
eSIM may not work even on compatible devices
Depending on the country of sale, carrier, and device model, eSIM functionality may be restricted.
QR codes may only be usable once
If you delete an eSIM that has been installed once, you may not be able to reconfigure it with the same QR code.
Usage start conditions vary by product
The timing of when the usage period starts can vary by product, such as at installation, when connecting to the Japanese network, or on a specified date.
Unlimited plans may have speed limits
Please check the limits on high-speed data and fair usage policies.
Be cautious with overseas roaming on the main line
If your main overseas line is ON, please turn OFF data roaming and also disable automatic data switching.
Be cautious when using public Wi-Fi
Avoid entering credit card information or important account information on free Wi-Fi whose provider cannot be verified.
Frequently Asked Questions about Japan eSIM for Foreign Visitors
Can I purchase eSIM after arriving in Japan?
Yes, you can purchase it.
However, you will need an internet connection for purchase and setup. If you want to use it immediately after arrival, it is recommended to purchase it before departure.
Do I need to pick up Japan eSIM at the airport?
Generally, online eSIMs do not require pickup at the airport.
How many GB do I need for a trip to Japan?
If your focus is on maps, transfer guides, and messages, aim for about 300-500MB per day.
If you use SNS or videos, consider 1GB or more per day.
What is the recommended GB for a one-week trip to Japan?
For general use, about 3-5GB is a good capacity, and if you use videos or video calls frequently, aim for 5-10GB or more.
Does Japan eSIM come with a Japanese phone number?
Most general travel eSIMs are data-only products and do not come with a Japanese phone number.
Can I use LINE or WhatsApp with Japan eSIM?
If you can connect to the internet, you can use messaging, voice calls, and video calls.
Do I need to remove my overseas SIM card?
If you have a dual SIM compatible device, you may be able to add Japan eSIM while keeping your overseas SIM.
Should I turn ON data roaming for Japan eSIM?
Depending on the product, you may need to turn ON data roaming for the Japan eSIM.
Please turn OFF data roaming for your main line.
Can I install Japan eSIM before departure?
If there are no issues with the usage start conditions, you can install it before departure.
Some products may start the usage period at the time of installation, so please check the product description.
Can I reset the eSIM after deleting it?
It varies by product, but you may not be able to reuse the same QR code.
Please do not delete it before confirming with support.
Can I use eSIM in rural areas of Japan?
The available areas depend on the communication provider you connect to and the local signal conditions.
In mountainous areas, underground, and remote islands, the signal may be weak.
For other questions, please refer to Frequently Asked Questions about eSIM.
Summary | Prepare Japan eSIM Before Departure and Connect Immediately Upon Arrival
Japan eSIM is a convenient communication method for foreign visitors to use the internet during their trip to Japan.
It can be purchased online, and there is no need to exchange physical SIM cards, pick it up at the airport, or return it after the trip.
If you install the eSIM before departure, you can use Google Maps, transfer guides, translation apps, LINE, and WhatsApp as soon as you arrive in Japan.
When choosing a Japan eSIM, please check the following items:
- Is your smartphone compatible with eSIM?
- Is the SIM lock removed?
- Usage period that matches your travel duration
- Data capacity needed for maps, SNS, and videos
- Is tethering supported?
- Do you need a Japanese phone number or SMS?
- When does the usage period start?
- Are additional charges and support available?
For a 3-day trip to Japan, aim for 1-3GB, and for general use over a week, aim for about 3-5GB.
If you use SNS, videos, and video calls frequently, choose a plan with ample capacity.
You can check the currently available products at Japan eSIM products and pricing plans.
If you want to compare capacities and usage periods, please refer to Japan eSIM Pricing and Plan Comparison.
