Immediately after arriving in Japan, there are many situations where you will want to use your smartphone, such as searching for routes from the airport to the hotel, train transfer information, contacting family, and using translation apps.
However, if you haven't prepared a means of communication, you may have to search for the airport's Wi-Fi or wait in line at a store to purchase a SIM card.
For those who want to use the internet immediately after arriving in Japan, the Japan eSIM, which can be purchased and set up before your trip, is convenient.
This article compares methods to connect to the internet after arriving in Japan and clearly explains the setup procedures and precautions for the eSIM that you should prepare before your trip.
If you want to summarize how to choose and use the Japan eSIM, please also check the Complete Guide to Japan eSIM.
How to Use the Internet Immediately After Arriving in Japan
The main communication methods available for travel in Japan are as follows:
- Japan eSIM
- SIM card
- Rental Wi-Fi
- International roaming
- Free Wi-Fi at airports, hotels, and stores
You can connect to the internet using any of these methods, but the preparation methods, costs, whether you need to pick something up, and the time until you can start using them vary.
| Communication Method | Preparation Before Travel | Procedures After Arriving in Japan | Can You Use It Immediately? |
|---|---|---|---|
| eSIM | Purchase & add to device | Turn on the line | ◎ |
| SIM Card | Purchase or reserve | Pick up & swap SIM | ○ |
| Rental Wi-Fi | Reservation | Receive the device | ○ |
| International Roaming | Check contract details | Turn on roaming | ◎ |
| Free Wi-Fi | Not needed | Find a connection | △ |
If You Want to Use the Internet Immediately After Arriving, eSIM is Recommended
For those who want to use the internet immediately after arriving in Japan, the Japan eSIM is recommended.
eSIM is a communication method that utilizes the SIM functionality built into the smartphone itself. There is no need to receive or swap a physical SIM card; you can add it to your device using the QR code or setup information that you receive after purchase.
If you complete the addition of the eSIM before departure, you can simply turn on the relevant line and switch to mobile data after arriving in Japan to start using it.
Benefits of Japan eSIM
- No need to purchase a SIM card at the airport
- No need to pick up a Wi-Fi router
- No need to swap a physical SIM card
- Can be purchased and set up before travel
- Easy to start communication immediately after arriving in Japan
- No return procedure required
You can check the plans available for travel, business trips, or temporary returns to Japan on the Japan eSIM product page.
How to Use a SIM Card
A SIM card is a communication method that involves inserting a physical card into your smartphone.
In addition to purchasing it before your trip and receiving it at home, you can also buy it at Japanese airports or electronics stores.
Benefits of SIM Cards
- Can be used on devices that do not support eSIM
- Easy to understand for those familiar with physical SIMs
- May allow you to choose a plan with a phone number
Precautions for SIM Cards
- Purchasing after arriving in Japan may take time to start using
- You need to swap the SIM card in your smartphone
- You need to keep your regular SIM card safe to avoid losing it
- A SIM pin may be required
If you want to use it immediately after arriving in Japan, you need to purchase it before your trip and check its compatibility.
How to Use Rental Wi-Fi
Rental Wi-Fi is a method of connecting your smartphone or computer to a dedicated Wi-Fi router.
There are services available that you can pick up at Japanese airports, which are suitable for sharing communication among family or groups.
Benefits of Rental Wi-Fi
- Easy to use for multiple people and devices
- No need to swap the SIM in your smartphone
- Can connect computers and tablets as well
Precautions for Rental Wi-Fi
- You need to pick it up at the airport or similar locations
- It may take time to process during busy times
- You need to carry the router during your trip
- Separate charging may be required
- You may need to return it before returning home
For those who want to move immediately after arriving in Japan, the eSIM, which does not require pickup, is more convenient.
How to Use International Roaming
International roaming is a method of using the line from your regular mobile phone company in Japan as is.
You may not need to prepare a new SIM or Wi-Fi router, and you can use it by turning on data roaming from your smartphone settings.
Benefits of International Roaming
- No need to swap SIM cards
- Easy to maintain your regular phone number
- Easy to connect immediately after arriving in Japan
Precautions for International Roaming
- Costs may be high
- Conditions vary depending on the mobile carrier
- There may be limits on the data capacity available
Before using, check the costs for international roaming, the countries covered, data capacity, and speed limitations.
How to Use Free Wi-Fi at Airports and Hotels
You may be able to use free Wi-Fi at Japanese airports, hotels, cafes, and commercial facilities.
This is a convenient temporary connection method if you haven't prepared a means of communication, but it cannot be used while moving, and you need to find a connection point.
Precautions for Free Wi-Fi
- Available locations are limited
- Connections may be unstable
- You may need to register or agree to terms of use
- Be cautious about security on public Wi-Fi
Relying solely on free Wi-Fi may mean you cannot use maps or transfer information while moving from the airport to the hotel.
If you want to use your smartphone steadily while moving, prepare communication methods such as eSIM, SIM cards, or rental Wi-Fi.
eSIM Setup Procedures to Prepare Before Your Trip
To use the eSIM immediately after arriving in Japan, it is important to complete the addition to your device in a stable Wi-Fi environment before departure.
- Check the number of days you will stay in Japan and the data capacity needed
- Purchase a Japan eSIM plan
- Check the QR code or setup information received via email
- Add the eSIM to your smartphone in a Wi-Fi environment
- Name the added eSIM something recognizable, like "Japan Trip"
- Turn on the relevant eSIM line after arriving in Japan
- Select the Japan eSIM for mobile data communication
- Turn on data roaming if necessary
For detailed setup methods for iPhone and Android, please refer to the eSIM Setup Guide.
Settings to Check After Arriving in Japan
After arriving in Japan, please check the following settings in order.
1. Turn on the eSIM line
From your smartphone's mobile communication settings, turn on the Japan eSIM that you added before your trip.
2. Switch mobile data communication to Japan eSIM
On dual SIM devices, you need to specify the Japan eSIM for mobile data communication instead of your regular main line.
3. Check data roaming
For some products, you may need to turn on data roaming. Please follow the instructions provided at the time of purchase.
4. Check the data communication of the main line
To prevent unexpected international roaming charges, it is advisable to turn off data roaming for your regular main line.
5. Check if you can connect to the internet
With Wi-Fi turned off, open a website or map app to check if mobile data communication is available.
What to Do If Japan eSIM Does Not Connect
If you cannot connect after arriving in Japan, please check the following items.
- Is the Japan eSIM line turned on?
- Is the Japan eSIM selected for mobile data communication?
- Is data roaming turned on?
- If APN settings are required for the product, are they entered correctly?
- Have you toggled airplane mode on and off?
- Have you restarted your smartphone?
- Are there any issues with the start date or coverage area?
Even if you cannot connect, do not delete the eSIM immediately. Once deleted, you may not be able to reconfigure it with the same QR code.
For detailed confirmation methods, please refer to What to Do If eSIM Does Not Connect.
Data Capacity Needed for Traveling in Japan
The data capacity needed for traveling in Japan varies depending on how you use your smartphone.
| Usage Style | Daily Estimate | Main Usage Content |
|---|---|---|
| Light Use | 500MB–1GB | Maps, transfer information, messages |
| Standard Use | 1–2GB | SNS, photo posting, web searches, translation |
| Heavy Use | 3GB or more | Video viewing, video calls, tethering |
| Want to Use Without Worrying About Remaining Data | Unlimited Plan | Frequent use of videos and tethering |
For more details, please check Estimated Data Usage.
Precautions Before Purchasing Japan eSIM
Check if Your Device Supports eSIM
Not all smartphones support eSIM.
Before purchasing, please check if your device is compatible on the List of eSIM-Compatible Devices.
Check the SIM Lock Status
If your smartphone has a SIM lock, you may not be able to use a travel eSIM.
Check the Timing for Starting Use
The timing for when the eSIM usage period begins varies by product, such as when it is installed or when it first connects to a Japanese network.
If you are adding it before your trip, please check the product page or the instructions after purchase.
Display the QR Code on Another Screen
If you received the QR code on the same smartphone, display it on a computer or another smartphone, or use the manual input setup information.
Do Not Delete the eSIM
Once you delete an added eSIM, you may not be able to reinstall it.
If communication troubles occur, check with support before deleting it.
Frequently Asked Questions
Can I Purchase eSIM After Arriving in Japan?
If you have an internet connection, you can purchase it even after arriving in Japan.
However, since the airport Wi-Fi may be crowded or unstable, it is recommended to purchase and set it up before your trip.
Is It Okay to Turn on eSIM Before the Trip?
The conditions for starting use vary by product. Some products start the usage period when you connect to a Japanese network, while others start from the time of installation.
Please follow the instructions provided after purchase.
Can I Set It Up on the Airplane?
Adding an eSIM requires an internet connection. Since in-flight Wi-Fi may be unstable, it is recommended to set it up at home or in a hotel before departure.
Can I Use LINE or WhatsApp with Japan eSIM?
If data communication is available, you can use messaging and internet calling apps like LINE, WhatsApp, and Messenger.
Can I Use Regular Phone Calls or SMS with Japan eSIM?
With a data-only plan, you cannot use regular phone calls or SMS with a phone number.
If you need a phone number, please check the eSIM Plan with Phone Number.
What Should I Do If I Cannot Connect After Arriving in Japan?
Check the eSIM line, mobile data, data roaming, and APN settings, and try toggling airplane mode on and off or restarting your device.
If the issue persists, please contact support without deleting the eSIM.
Conclusion
The methods to use the internet immediately after arriving in Japan include eSIM, SIM cards, rental Wi-Fi, international roaming, and free Wi-Fi.
Among these, the Japan eSIM is a convenient communication method that does not require swapping physical SIMs, picking up at the airport, or returning a Wi-Fi router, and can be prepared before your trip.
If you add the eSIM before departure, you can use maps, transfer information, translation apps, and more immediately after arriving in Japan by checking the line, mobile data, and data roaming.
Check your travel days and required data capacity, and choose a Japan eSIM that fits your usage style.
