When setting up an eSIM for your trip to Japan, many people may wonder, "Is APN configuration necessary?" "What should I enter for the APN?"
For many Japanese eSIMs, the APN is automatically configured when you add the eSIM to your smartphone, so manual input is not required. However, depending on the eSIM you are using and the Android device, you may need to manually configure the APN to connect to the internet.
This article clearly explains the cases where APN configuration is necessary and unnecessary for Japanese eSIMs, how to check for iPhone and Android, and what to do if you can't connect even after setting the APN.
Is APN configuration necessary for Japanese eSIM?
Whether APN configuration is necessary for a Japanese eSIM depends on the type of eSIM purchased and the smartphone being used.
Generally, you can determine as follows:
- eSIMs with automatic APN configuration: Manual configuration is not required
- eSIMs with APN information provided after purchase: Manual configuration may be necessary
- Android devices that cannot connect even after adding the eSIM: APN verification is needed
- If the communication profile is correctly applied on an iPhone: Manual configuration is usually not required
First, add the Japanese eSIM to your smartphone and ensure that mobile data and data roaming are correctly set up, then check if you can connect to the internet.
If you can connect without any issues, there is no need to manually change the APN.
For those preparing to get an eSIM, you can check plans that suit your usage days and data capacity from Japanese eSIM products and pricing plans.
What is APN?
APN stands for "Access Point Name," which is the connection information needed to connect your smartphone to the internet service of your carrier.
The smartphone uses the APN information to determine which network to use to connect to the internet.
If the APN is not correctly configured, even if the device shows an antenna or carrier name, you may not be able to connect to the internet.
Main items to input for APN configuration
For eSIMs that require manual configuration, you generally need to input the following information:
- Name
- APN
- Username
- Password
- Authentication type
- APN type
However, it is not always necessary to fill in all fields. Items not listed in the instructions received after purchase should generally be left blank.
Entering APN information from other companies or different eSIMs may prevent you from connecting, so be sure to use the information specific to the Japanese eSIM you purchased.
Cases where APN configuration is not necessary
In the following cases, manual APN configuration is generally not required.
APN is automatically configured when adding the eSIM
For many travel eSIMs, when you scan the QR code to add the eSIM, the APN information is automatically registered on the device.
If you can connect simply by turning on the eSIM line after arriving in Japan and selecting the Japanese eSIM for mobile data, do not change the APN.
No mention of APN configuration in the post-purchase instructions
If the setup instructions or QR code email received after purchase do not mention APN information, it is likely that the eSIM is automatically configured.
In that case, first check the following items:
- The Japanese eSIM line is ON
- The Japanese eSIM is selected for mobile data
- Data roaming for the Japanese eSIM is ON
- Data roaming for the main line is OFF
For basic setup instructions for the eSIM, please refer to eSIM setup methods for iPhone and Android.
Cases where APN configuration is necessary
In the following cases, manual APN configuration may be necessary.
APN information is provided in the post-purchase instructions
If the eSIM setup email or usage instructions include the APN name, username, password, etc., input that information into the device.
Due to differences in uppercase and lowercase letters, half-width and full-width characters, and symbols, you may not be able to connect, so please enter it accurately as instructed.
The antenna for the eSIM is displayed but cannot connect
Even if the device shows an antenna or "4G," "LTE," "5G," etc., if you cannot use websites or map apps, the APN may not be correctly configured.
APN is not automatically registered on Android devices
On some Android devices, the APN information may not be automatically reflected even after adding the eSIM.
In particular, devices purchased overseas, SIM-free devices, or devices using manufacturer-specific Android may require manual addition of the APN.
How to configure APN for Japanese eSIM on iPhone
On iPhone, in many cases, the APN is automatically configured when adding the eSIM. If you can communicate normally, there is no need to manually change the APN.
If you are instructed to manually configure the Japanese eSIM you purchased, follow these steps to check:
- Open "Settings"
- Select "Cellular"
- Select the Japanese eSIM you purchased
- Select "Cellular Data Network"
- Input the provided APN information
- Close the settings screen
- Turn Airplane Mode ON and then OFF, or restart the device
Depending on the version of iOS and the carrier's settings, "Cellular Data Network" may not be displayed.
If this item is not displayed, it is possible that the APN is automatically configured or that the settings cannot be changed by the user. Please check the instructions from the purchase source and do not delete the configuration profile on your own.
If the APN item is not displayed on iPhone
If the APN settings screen is not displayed, check the following items:
- Is the Japanese eSIM line ON?
- Is the Japanese eSIM selected for mobile data?
- Have you received instructions for the configuration profile from the purchase source?
- Is the device SIM-locked?
- Is the iPhone you are using compatible with eSIM?
You can check the list of compatible devices at eSIM compatible devices list.
How to configure APN for Japanese eSIM on Android
On Android, the names of the settings screens may vary depending on the device manufacturer and OS version.
Generally, you can add the APN using the following steps:
- Open "Settings"
- Select "Network & Internet" or "Connections"
- Select "SIM," "Mobile Network," or "SIM Manager"
- Select the Japanese eSIM you purchased
- Select "Access Point Names" or "APN"
- Select "Add" or "+"
- Input the APN information provided after purchase
- Save the settings
- Select the created APN
- Restart the device
Simply entering the APN may not reflect the settings. Be sure to save the input and check that the selection button next to the created APN is enabled.
Common check locations for Google Pixel
On Google Pixel, you generally check in the following order:
"Settings" → "Network & Internet" → "SIM" → "Japanese eSIM" → "Access Point Names"
Common check locations for Samsung Galaxy
On Samsung Galaxy, you generally check in the following order:
"Settings" → "Connections" → "Mobile Networks" → "APN"
If the display differs depending on the model or OS, please use the search function at the top of the settings screen to search for "APN" or "Access Point Names."
Points to note when configuring APN
Use only the APN provided by the purchase source
APN information varies by eSIM product and carrier. Entering APN from a different product found online or from a previously used SIM card will not allow you to connect.
Always use the information provided in the email after purchase, setup manual, or product page.
Correctly input uppercase and lowercase letters for APN
APN, username, and password may be case-sensitive. Also, check for any extra spaces or full-width characters.
Do not input unnecessary items
Do not change items such as MCC, MNC, proxy, port, etc., that are not specified by the purchase source.
Changing the default values may prevent you from connecting to the communication network.
Save and select the APN
On Android, after creating a new APN, you need to save it and select the created APN. If you close the screen without saving or if another APN is selected, the settings will not be reflected.
If you can connect normally, do not change
If you can connect to the internet without any issues, there is no need to manually change the APN.
Entering an incorrect APN may prevent you from connecting to the internet that was previously available.
If you set the APN but still cannot connect with the Japanese eSIM
If you have correctly configured the APN but still cannot connect to the internet, there may be issues with settings other than the APN.
1. Turn ON the Japanese eSIM line
Simply adding the eSIM to the device may not activate the line. Check from the settings screen that "Turn ON this line" or "Use SIM" for the Japanese eSIM is enabled.
2. Select the Japanese eSIM for mobile data
Check if the mobile data line is still set to your usual main line.
For internet communication during your trip to Japan, please select the Japanese eSIM.
3. Turn ON data roaming
Many travel Japanese eSIMs require you to turn ON data roaming to connect to the local network.
It is safe to keep data roaming ON for the Japanese eSIM and OFF for your usual main line.
4. Toggle Airplane Mode ON and OFF
Turning Airplane Mode ON for about 10 seconds and then OFF will reconnect to the network.
5. Restart your smartphone
After creating or changing the APN, restarting your smartphone may reflect the settings.
6. Check if the created APN is selected
In the case of Android, even if the entered information is displayed in the APN list, it will not be used if that APN is not selected.
Check if there is a checkmark or selection mark next to the created APN.
7. Set network selection to automatic
Usually, the network selection should be set to "automatic." If you manually select a different carrier, you may not be able to connect to the internet.
8. Check the start date and coverage area
If the validity period of the eSIM has not started or has expired, you will not be able to communicate. Also, there may be temporary weak signals in underground or mountainous areas.
For detailed confirmation methods when you cannot connect, please refer to What to do when the eSIM cannot connect.
Is it okay to delete the eSIM if I cannot configure the APN?
Even if you cannot connect after setting the APN, do not delete the Japanese eSIM immediately.
The QR code for the eSIM may be set to be scannable only once. If you delete it from the device, you may not be able to reinstall it using the same QR code.
If you cannot connect, prepare the following information and contact support.
- Order number
- Name of the device you are using
- Your current location
- Error message displayed
- Screenshot of the mobile communication settings screen
- Screenshot of the APN settings screen
For items to check before contacting, please also refer to eSIM setup and support information.
Frequently Asked Questions about APN for Japanese eSIM
Can I communicate without configuring the APN?
If the Japanese eSIM automatically configures the APN, you can communicate without manual configuration.
If the eSIM line, mobile data, and data roaming are correctly set and you can communicate, there is no need to change the APN.
Where is the APN information listed?
If manual configuration is necessary, it is listed in the email received after purchase, QR code instructions, setup manual, product page, etc.
If you cannot find the APN information, do not input it on your own; please check with the support from the purchase source.
Is manual APN configuration necessary on iPhone?
On iPhone, APN is often automatically configured, so manual configuration is generally not required.
However, if you are instructed to input the APN or install a configuration profile from the purchase source, please follow those instructions.
I cannot save the APN on Android
If required fields are missing or due to device restrictions, you may not be able to save it.
Check if the "Name" and "APN" specified by the purchase source are entered, and select "Save" from the menu in the upper right corner.
Is it okay to reset the APN to default settings?
Executing "Reset to default settings" may delete the manually added APNs.
Before resetting, save the APN information provided after purchase. If you can communicate normally, it is recommended not to reset.
What if the antenna is not displayed even after configuring the APN?
If the antenna is not displayed, there may be issues with the eSIM line, compatible device, start date, network selection, etc., rather than the APN.
Please also check if the device you are using is compatible with eSIM and if it is SIM-unlocked.
For other questions, please refer to Frequently Asked Questions about eSIM.
When choosing a Japanese eSIM, also check the usage days and data capacity
When selecting a Japanese eSIM, it is important to check not only the method of APN configuration but also the data capacity that matches your travel days and purpose.
If your main usage is maps, transit guides, translations, and messaging, a small capacity plan may suffice. If you frequently use video streaming, posting videos on social media, video calls, or tethering, a large capacity or unlimited plan is recommended.
For estimated data usage by purpose, please check Estimated Data Usage.
If you want to compare by length of stay and data capacity, please also refer to Comparison of Japanese eSIM pricing and plans.
Conclusion | Check the instructions for the purchased Japanese eSIM regarding APN configuration
For many Japanese eSIMs, the APN is automatically configured, so manual input is not necessary.
However, if the post-purchase instructions include APN information or if you cannot connect to the internet on an Android device, manual configuration may be required.
When configuring the APN, check the following points:
- If you can connect normally, do not change the APN
- Use only the APN information provided by the purchase source
- Be careful with uppercase and lowercase letters and extra spaces
- On Android, save and select the APN
- Turn ON data roaming for the Japanese eSIM
- If you cannot connect, do not delete the eSIM immediately
If you want to summarize how to choose, purchase, and set up a Japanese eSIM, please refer to Complete Guide to Japanese eSIM.
For those preparing communication means for their trip to Japan, you can check plans that suit your travel days from Japanese eSIM products and pricing plans.
