When searching for eSIMs for travel to Japan, you may come across terms like "Compatible with au network" "KDDI Network."
The au network provides stable communication quality throughout Japan, making it easy to use not only in urban areas but also in rural regions.
In this article, we will explain in detail what the au network is, why it is recommended for travel in Japan, its advantages and disadvantages, and points to consider when choosing an eSIM.
If you want to know more about Japan eSIMs, please also check out the Complete Guide to Japan eSIM .
What is the au network?
The au network is a mobile communication network provided by KDDI.
It can be used throughout Japan, covering a wide area from urban to rural locations.
| Item | Details |
|---|---|
| Telecommunication Company | KDDI (au) |
| Coverage Area | Nationwide in Japan |
| 5G Support | Available in certain areas |
| Recommended for Travelers | ★★★★☆ |
There are many products available that connect to the au network for travel eSIMs.
Reasons Why the au Network is Recommended for Travelers
Stable in Both Urban and Rural Areas
You can enjoy relatively stable communication not only in Tokyo, Osaka, and Kyoto but also in rural cities.
Wide Coverage of 5G Areas
For compatible devices, the areas where 5G communication is available are expanding.
Comfortable to Use While Sightseeing
You can comfortably use Google Maps, LINE, social media, transit guides, and video streaming.
Communication Areas of the au Network
| Region | Ease of Use |
|---|---|
| Tokyo | ★★★★★ |
| Osaka | ★★★★★ |
| Kyoto | ★★★★★ |
| Hokkaido | ★★★★☆ |
| Kyushu | ★★★★☆ |
| Mountain Areas | ★★★★☆ |
For general sightseeing trips, you will hardly encounter any issues with communication areas.
Who is the au Network Recommended For?
- Those traveling to Tokyo, Osaka, and Kyoto
- Those who also plan to visit rural cities
- Those who prioritize stable communication quality
- First-time users of eSIM in Japan
- Those who want to utilize 5G coverage
Advantages and Disadvantages of the au Network
Advantages
- Stable communication in both urban and rural areas
- Wide coverage of 5G areas
- Many travel eSIMs utilize it
- Easy to use comfortably while sightseeing
Disadvantages
- In mountainous areas, the Docomo network may be more reliable
- Different products may use different networks
- Communication speed may decrease during peak times
In general, you will hardly face any communication issues with the au network during your trip to Japan.
Comparison with Docomo and SoftBank Networks
| Comparison Item | au | Docomo | SoftBank |
|---|---|---|---|
| Urban Areas | ★★★★★ | ★★★★★ | ★★★★★ |
| Rural Areas | ★★★★☆ | ★★★★★ | ★★★★☆ |
| Mountain Areas | ★★★★☆ | ★★★★★ | ★★★☆☆ |
| 5G Support | ★★★★★ | ★★★★★ | ★★★★★ |
| Recommended for Travelers | ★★★★☆ | ★★★★★ | ★★★★☆ |
For trips centered around urban areas, you can usually enjoy comfortable use of any of the au, Docomo, or SoftBank networks.
If you plan to travel to rural or mountainous areas, it may be good to compare with the Docomo network as well.
Points to Consider When Choosing an au Network eSIM
Select a Plan that Matches Your Travel Duration
Choose a plan that fits your stay, ranging from 3 days to 30 days.
Check the Required Data Capacity
If you mainly use Google Maps, a small capacity is sufficient, but for video streaming or tethering, a larger capacity plan is recommended.
Confirm Compatible Devices
Before purchasing, please check the List of eSIM-Compatible Devices .
Check the Setup Method
For first-time users, the eSIM Setup Guide can also be helpful.
Frequently Asked Questions
Can the au network be used throughout Japan?
Yes. It can be widely used not only in urban areas but also in rural regions.
Is the au network recommended for travelers?
Yes. The communication quality is stable, making it safe to use during your trip to Japan.
Can I use 5G communication?
If you have a compatible device and are in a supported area, there are products that support 5G communication.
Can it be used in rural areas?
It can be used in many rural cities. However, communication conditions may vary in mountainous areas depending on the location.
Will it always be the au network with eSIM?
No. The telecommunication company used may differ by product. Please check the supported network before purchasing.
What should I do if I cannot connect?
Please check the eSIM connection, mobile data communication, data roaming, and APN settings in order.
Which is better, the au network or the Docomo network?
There is generally no significant difference if you are mainly in urban areas. However, the Docomo network is also popular if you plan to travel to rural areas.
Where can I purchase an eSIM for travel to Japan?
Many products can be purchased online, and you can easily set them up by scanning a QR code.
Conclusion
The au network provides stable communication quality in both urban and rural areas and is a popular network for eSIMs for travel to Japan.
- Easy access to high-speed communication in urban areas
- Stable communication quality even in rural areas
- Wide coverage of 5G areas
- Recommended for first-time travelers to Japan
While comparing travel duration and data capacity, choose the Japan eSIM that suits you best.
