FAQ Category Activation & Usage

Data eSIM Activation Guide

Q1：Do I need to issue the QR Code immediately after receiving the Activation URL?

A: ❌ No, you do not need to issue it immediately.
🕒 Newly applied eSIMs have a 45-day QR Code issuance period.

Recommendation:
✅ Issue the QR Code before departure.
✅ This prevents the usage period from starting early due to flight changes, typhoons, or trip cancellations.

Q2：What does “Complete operation within 44 days, automatically activated on the 45th day” mean?

A:
This means:

📌 The Activation URL operation period before pressing “Issue”.
⏰ Please complete QR Code issuance within 45 days after receiving the Activation URL.
⚠️ If the QR Code is not issued after 45 days:
➡️ The system will automatically start counting the usage period.
➡️ The countdown will begin even if you are outside Japan.

Q3：Will the usage period start immediately after pressing “Issue”?

A: ❌ No.
Pressing “Issue” only generates the QR Code.
The usage period does not start immediately after issuance.
The following steps must be completed:
1️⃣ QR Code issuance
2️⃣ eSIM installation
3️⃣ Arrival in Japan
4️⃣ Smartphone connects to the docomo network
➡️ The eSIM will then be officially activated and the usage period will begin.

Q4：How is the usage period calculated?

A:
After eSIM activation:
🇯🇵 The usage period is calculated based on Japan Standard Time (JST) calendar days.
Example:
📅 7/14: Issue and install eSIM in Taiwan
📅 7/15: Arrive in Japan and connect to the docomo network, will be counted as Day 1.

Q5：Can I issue the QR Code during system maintenance?

A: System maintenance time: Every Tuesday 22:00～Every Wednesday 09:00 is the system maintenance period.
✅ Please complete QR Code issuance before Tuesday 22:00.
⚠️ If you operate during maintenance:
・The status may remain pending.
・The QR Code will be issued after maintenance is completed.

Q6：Do I need to keep the page open after pressing “Issue”?

A: ❌ No.
After pressing “Issue”:
✅ You may close the page.
✅ Open the Activation URL again later to check the result.
📌 You can check:
・QR Code issuance status
・Activation start/end dates
・Remaining data / used data capacity

Can I receive Taiwan SMS messages for free while in Japan?

Yes. You can receive Taiwan SMS messages (including verification codes) for free while in Japan.

📌 Explanation:
• Taiwan mobile numbers (such as Chunghwa Telecom / Taiwan Mobile) can still receive SMS messages while you are in Japan.
• Even without applying for international roaming, SMS reception usually works as long as the SIM card remains active.
• Receiving SMS messages generally does not incur any charges (actual conditions may vary depending on your mobile carrier).

📌 Dual SIM Settings (for both Android and iPhone):
• Keep both your original SIM (Taiwan number) and JB SIM enabled at the same time.
• For calls and SMS, we recommend keeping your original SIM (SIM1).
• Switch mobile data to the JB SIM (SIM2) for internet access.
• The same settings apply when using eSIM, allowing both SIMs to be used simultaneously.

📌 Recommendation:
• Switch mobile data to the JB SIM after arriving in Japan.
• This helps prevent accidental roaming charges from using mobile data on your original SIM.

How can I prevent my original SIM from being used for international roaming?

To avoid accidentally using your original SIM and incurring international roaming charges, please follow the settings below:

📌 Basic Settings
• Switch Mobile Data to the SIM/eSIM you use in Japan.
• Turn off the “Allow Mobile Data Switching” function.
• This prevents your device from automatically using your original SIM for internet access.

📌 SMS Information
• You can continue to receive Taiwan SMS messages normally (usually free of charge).
• SMS charges from other countries depend on the regulations of your original mobile carrier.

📌 To completely avoid roaming charges, you can turn off your original SIM:

【iOS Devices】
Settings → Cellular → Select your original SIM → Turn off “Turn On This Line”

【Android Devices】
Settings → Connections → SIM Card Manager → Select your original SIM → Turn off

📌 Recommendation
If you do not need to use your original phone number, we recommend turning off your original SIM completely to prevent any accidental roaming charges.

Can I use the SIM/eSIM again after leaving Japan and returning later?

Yes, you can.

As long as your SIM/eSIM is still within the validity period, you can continue using it when you re-enter Japan, even if you temporarily leave Japan.

📌 After returning to Japan:
• Turn on Mobile Data
• Switch Mobile Data to the JB SIM/eSIM
• Wait for your phone to reconnect to the Japanese mobile network

There is no need to apply again or reinstall the SIM/eSIM. It can be used normally as long as it remains within the validity period.

Free Wi-Fi Services at Japanese Airports

If you are unable to complete activation immediately after arriving in Japan, please connect to the airport’s free Wi-Fi first and contact our customer support. We will assist you in checking your settings and activation status.

• New Chitose Airport
https://www.new-chitose-airport.jp/ja/service/internet_fax_copy/lan/

• Hakodate Airport
https://www.airport.ne.jp/facility/wifi/

• Sendai Airport
https://www.sendai-airport.co.jp/service/wifi.html

• Narita International Airport
https://www.narita-airport.jp/jp/service/svc_33_wire

• Haneda Airport
https://tokyo-haneda.com/service/facilities/wireless_lan.html

• Chubu Centrair International Airport
https://www.centrair.jp/service/wireless-lan.html

• Kansai International Airport
https://www.kansai-airport.or.jp/service/internet/06.html

• Fukuoka Airport
https://www.fukuoka-airport.jp/service/wifi01.html

• Aso Kumamoto Airport
https://www.kumamoto-airport.co.jp/facilities/kumamoto-free-wi-fi/

• Naha Airport
https://www.naha-airport.co.jp/service/wifi/wifi-spot/

📌 Recommendation
Before departure, please save screenshots of our customer support contact information and your order details so that you can quickly receive assistance after arriving in Japan.

What should I do if my flight is delayed or canceled due to a typhoon?

📌 JB eSIM
Since the eSIM activation time can be determined by the customer, we recommend completing the eSIM issuance process after confirming that your flight will depart as scheduled.

• eSIM not yet issued: You can keep it and use it at a later time.
• Activation URL deleted: You can request a new Activation URL through our official LINE account.

📌 JB SIM Card
As long as the SIM card has not been inserted into a device and has not connected to the Japanese Docomo network, it will not be activated and can be kept for your next trip to Japan.

📌 JB Voice SIM / eSIM
Since the Japanese phone number application process begins immediately after the order is submitted, cancellations or refunds are generally not available once the application has been completed.

If you are unable to travel to Japan due to a flight cancellation, please contact us through our official LINE account. We will assist you in confirming the available options and provide further support.

What should I do if I cannot scan the QR code on my own phone after issuing it from my phone?

🅰️【【Settings】➡【Mobile Services】➡【Add eSIM】➡【Use Mobile Barcode】➡ Scan the QR Code

➀Take a screenshot of the QR code and send it to another device so you can scan it with your phone.

②Print the QR code so you can scan it with your phone.

③Select【Manual Input of Details】and copy the【SM-DP+ address】and【Activation Code】from the【eSIM Activation URL】. For detailed instructions, please refer to the 👉 Instructions Before Use & Set up the APN

Why can’t the eSIM be fully activated while outside of Japan?

🅰️Our eSIM uses the local docomo mobile network in Japan, so it can only receive the signal after entering Japan. Once the signal is received, it will automatically activate immediately.

【Note】Most of the eSIMs currently available on the market are international roaming eSIMs sold by telecom companies from various countries in Taiwan. This is why they can be set up before traveling abroad, and you need to turn off roaming while outside Japan and enable international roaming after arriving in Japan. Since our eSIM is a local product for Japan, you do not need to enable roaming.