When traveling to Japan or returning temporarily, it's reassuring to prepare an environment that allows you to connect to the internet immediately after arriving in Japan. During your stay in Japan, you will often use your smartphone for moving from the airport to the hotel, map applications, transfer guides, translation apps, social media, and confirming hotel or flight reservations.
In this article, we will compare the main methods of connecting to the internet while traveling in Japan, clearly explaining the advantages and disadvantages of each, as well as how to choose a communication method that suits your travel style.
Main Methods of Connecting to the Internet While Traveling in Japan
The main methods of using the internet while traveling in Japan are " Japan eSIM ", "Rental Wi-Fi", "SIM card", "International roaming", and "Free Wi-Fi".
Each method varies in terms of cost, setup process, portability, and compatible devices. Choose based on the number of travel days, number of users, smartphone compatibility, and required data capacity.
If you want to check the recommended order of communication methods, please refer to the Japan Travel Communication Method Ranking.
1. Connect with Japan eSIM
Japan eSIM is a digital SIM that allows you to add a communication plan to your smartphone without using a physical SIM card. If you have an eSIM-compatible device, you can set it up using the QR code that arrives after purchase.
Japan eSIM is suitable for those who want to use the internet immediately after arriving in Japan, as it can be purchased and set up online before your trip.
There is no need to swap SIM cards, and you don't have to carry a router like with rental Wi-Fi or return it after your trip.
Advantages of Japan eSIM
- Can be purchased online before the trip
- Easy to start communication immediately after arriving in Japan
- No need to swap SIM cards
- No need to carry a Wi-Fi router
- No need for pickup or return procedures
- No worry about losing your regular SIM card
Who Should Use Japan eSIM
- Those who want to use the internet immediately after arriving in Japan
- Those who do not want to swap SIM cards
- Those who do not want to carry a Wi-Fi router
- Those planning solo or short trips
- Those returning temporarily to Japan
- Those visiting Japan for business
Before using eSIM, check if your smartphone is compatible by referring to the list of eSIM-compatible devices. For setup instructions, please check the eSIM setup guide.
2. Connect with Rental Wi-Fi
Rental Wi-Fi is a method of using a portable Wi-Fi router to connect your smartphone or tablet.
Since multiple devices can connect to one router, it is suitable for family or group trips where everyone is traveling together.
Advantages of Rental Wi-Fi
- Can share communication among multiple people
- Can connect devices other than smartphones
- Can be used with devices that do not support eSIM
- No need to swap SIM cards
Points to Note About Rental Wi-Fi
- Need to carry the Wi-Fi router
- If the router runs out of battery, you cannot connect
- Pickup and return procedures are necessary
- Additional fees may apply in case of loss or damage
- You cannot connect if you are separated from the person with the router
If you are unsure whether to choose Wi-Fi or eSIM for your trip to Japan, please refer to Which is Recommended for Japan Travel: Wi-Fi or eSIM?.
3. Connect with a SIM Card
A SIM card is a physical SIM card for Japan travel that you insert into your smartphone to connect to the internet. You can purchase it at the airport, electronics stores, or online shops.
The advantage is that it can be used with smartphones that do not support eSIM, but you will need to swap it with your regular SIM card.
Advantages of SIM Cards
- Can be used with devices that do not support eSIM
- Can choose from various usage periods and capacities
- Can communicate using just your smartphone
Points to Note About SIM Cards
- Need to swap SIM cards
- Risk of losing your original SIM card
- May require a SIM pin
- Some products may require APN settings
- Need to check the size of the SIM card
For differences between SIM cards and eSIM, please check Do You Need a SIM Card for Japan Travel? Differences with eSIM.
4. Connect with International Roaming
International roaming is a method of using the SIM or communication service from your current mobile carrier in Japan without any changes.
It is convenient because you do not need to purchase a new SIM card or swap SIM cards.
Advantages of International Roaming
- Can use your current SIM as is
- Less setup for new communication services
- Easy to maintain your usual phone number
- Easy to use immediately after arriving in Japan
Points to Note About International Roaming
- Costs may be high depending on your contract
- There may be limits on available data capacity
- Speed may decrease if you exceed the data limit
- Advance application may be required
If you plan to use international roaming, check with your mobile carrier before departure regarding the countries covered, costs, and available data capacity.
5. Connect with Free Wi-Fi
In Japan, you may find free Wi-Fi available at airports, hotels, stations, cafes, commercial facilities, and tourist attractions.
While the advantage is that you can save on communication costs, the places where you can use it are limited. It may be difficult to rely solely on free Wi-Fi for all your communication needs during your trip to Japan, as you may not be able to connect while moving or outdoors.
Advantages of Free Wi-Fi
- No communication fees
- Easy to use at hotels and airports
- Can save data capacity on eSIM or SIM cards
Points to Note About Free Wi-Fi
- Cannot be used while moving
- May have slow communication speeds
- Connection may be unstable
- Registration or authentication may be required
- Need to be cautious about security
It is recommended to use free Wi-Fi in combination with communication methods like eSIM or SIM cards as a supplementary option.
Comparison of Communication Methods for Japan Travel
| Communication Method | Ease of Preparation | Items to Bring | Pickup/Return | Recommended for |
|---|---|---|---|---|
| Japan eSIM | High | Smartphone only | Not required | Solo travel, short trips, temporary return |
| Rental Wi-Fi | Normal | Wi-Fi router | Required | Family trips, group travel |
| SIM Card | Normal | SIM card, SIM pin | Varies by product | Those using non-eSIM compatible devices |
| International Roaming | High | Smartphone only | Not required | Those who want to use it for a short time |
| Free Wi-Fi | High | Not required | Not required | Those who want to use communication as a supplement |
If You Want to Connect Immediately After Arriving in Japan, Japan eSIM is Recommended
For those who want to connect to the internet immediately after arriving in Japan, Japan eSIM is recommended.
Since it can be purchased and set up online before departure, you can reduce the hassle of searching for a SIM card vendor at the airport or picking up a Wi-Fi router.
After arriving at the airport, turn on the Japan eSIM line and correctly set up mobile data communication and data roaming, and you can immediately use maps and transfer guides.
For detailed steps, please check How to Use the Internet Immediately After Arriving in Japan.
Check the Required Data Capacity for Your Trip to Japan
The required data capacity during your trip to Japan varies depending on the apps you use and the length of your stay.
If you mainly use map apps, transfer guides, messaging, and web searches, you can manage with relatively low data capacity. On the other hand, if you plan to post photos and videos on social media, watch videos, make video calls, or use tethering, you will need a larger capacity.
| Main Usage | Estimated Daily Amount |
|---|---|
| Maps, transfer guides, messaging | About 500MB to 1GB |
| Maps, web searches, social media browsing | About 1GB to 2GB |
| Video viewing, video calls | 3GB or more |
| Frequent video posting, tethering | Large capacity or unlimited plan |
For detailed data capacity estimates, please refer to How Many GB Do You Need Per Day for Japan Travel? and Estimated Data Usage Fees.
Things to Check Before Using eSIM
Check if Your Device is eSIM-Compatible
To use eSIM, your smartphone must be compatible with eSIM. Before purchasing, check the list of eSIM-compatible devices for the model you plan to use.
Check if SIM Lock is Released
If your smartphone is SIM-locked, you may not be able to use the purchased eSIM. Check the SIM lock status of your device before departure.
Check the Setup Method
Most eSIMs are added by scanning a QR code that arrives after purchase with your smartphone. Since the setup screens differ between iPhone and Android, first-time users should check the eSIM setup guide for peace of mind.
Check the Timing for Starting Use
eSIMs have plans where the usage period starts when the QR code is scanned and plans where it starts when connected to the Japanese network.
If you set it up too early, the validity period may start before your trip, so be sure to check the usage conditions of the product you purchased.
Choose a Plan that Matches Your Length of Stay
It is important to choose the usage period and data capacity according to the number of days you will be in Japan and how you plan to use your smartphone.
For choosing based on the length of stay, please refer to Recommended eSIM Plans for Japan Travel.
Check if You Need a Phone Number or SMS
Many Japan eSIMs for travelers are data-only products. With data-only eSIMs, you cannot use regular phone calls or SMS with a standard phone number.
If you need calls or SMS, please check the eSIM plans with phone numbers before purchasing.
If You Cannot Connect to the Internet After Arriving in Japan
If you set up Japan eSIM but cannot connect to the internet, please check the following items.
- Is the Japan eSIM line ON?
- Is the Japan eSIM selected for mobile data communication?
- Is data roaming ON?
- Is airplane mode OFF?
- Is the APN setting correct?
- Have you restarted your smartphone?
- Are there any issues with the usage period or data capacity?
For detailed troubleshooting methods, please refer to How to Troubleshoot When Japan eSIM is Not Connecting.
If the issue persists after checking the settings, prepare your order number, device name, OS, settings screen, error screen, etc., and contact Japan eSIM Support.
Frequently Asked Questions
Is Free Wi-Fi Enough for Traveling in Japan?
You may find free Wi-Fi available at hotels, airports, cafes, etc. However, since there are many places where you cannot use it while moving or sightseeing, it is advisable to prepare eSIM, SIM cards, or rental Wi-Fi if you want to use the internet constantly.
Can I Purchase eSIM After Arriving in Japan?
If you have an environment where you can connect to the internet, such as Wi-Fi, you can purchase eSIM even after arriving in Japan. However, if you want to use it immediately after arrival, it is recommended to purchase and set it up before departure.
When Should I Set Up Japan eSIM?
Basically, it is recommended to add eSIM in a stable Wi-Fi environment before departure and turn on the target line and data roaming after arriving in Japan.
The conditions for starting use vary by plan, so please check the product description before scanning the QR code.
Can I Use a Phone Number with eSIM?
With data-only eSIMs, you cannot use regular phone calls or SMS with a standard phone number.
Internet calls via LINE or WhatsApp can be used if data communication is available. If you need a regular phone number or SMS, please check the eSIM plans with phone numbers.
Can I Use Tethering with eSIM?
Tethering support varies by the plan you purchase. If you plan to connect a computer or tablet, please check the product page for tethering availability.
For other questions, please refer to Frequently Asked Questions about eSIM.
Conclusion
The methods for connecting to the internet while traveling in Japan include Japan eSIM, rental Wi-Fi, SIM cards, international roaming, and free Wi-Fi.
Rental Wi-Fi is easy to share among multiple people, and SIM cards can be used with devices that do not support eSIM. International roaming is easy to set up, and free Wi-Fi is convenient as a supplementary means to save on data usage.
Among these, Japan eSIM is particularly suitable for solo travelers, short trips, business trips, and temporary returns, as it can be purchased and set up online before the trip, eliminating the need to swap SIM cards, pick up products, or carry and return a Wi-Fi router.
Before purchasing, check for eSIM compatibility, SIM lock status, usage period, data capacity, conditions for starting use, tethering, and support for phone numbers or SMS, and choose a communication method that fits your travel style.
