A: If the eSIM activation is stuck or your Japanese phone number does not appear, please check the following two settings first:
① Select “Voice & Data” for the plan
Do not select “Data Only.”
② Make sure the eSIM is turned on
Go to:
Settings → Cellular/Mobile Service → SIMs → Use “Travel – docomo” → Turn On
After completing these settings, your Japanese phone number should normally appear.
A: 🌍 You can apply from anywhere in the world, with no specific country restrictions.
JB Voice eSIM／SIM uses the Japanese docomo network and can be used in countries where docomo international roaming services are available.
Before using the service, please check whether your smartphone model is compatible with docomo international roaming.
For details, please refer to: International Roaming Device Compatibility
A: We cannot guarantee successful activation.
A “physical eSIM” is a product that uses a physical SIM card with special technology to provide eSIM-like functionality. It is different from the standard eSIM built into smartphones.
JB Voice eSIM activation requires an EID (32 digits). Depending on the EID’s source, authentication status, or carrier system restrictions, a physical eSIM may encounter an “EID Error” during activation.
Therefore, customers using a physical eSIM may submit an application, but we cannot guarantee successful activation.
⚠️ If activation fails due to an EID-related issue, a reissue fee of ¥2,200 (tax included) will apply.
A:
Before using JB Voice eSIM, please make sure that your smartphone meets both of the following requirements:
Please note that docomo’s international roaming service has device compatibility limitations. Therefore, even if your smartphone supports eSIM, it does not necessarily mean that JB Voice eSIM will work properly.
If you are not sure whether your smartphone supports eSIM, or whether it is compatible with docomo’s international roaming service, we recommend choosing the JB Voice Physical SIM Card instead.
A physical SIM card does not require eSIM support. As long as your smartphone has a compatible physical SIM card slot, you can use it. You can also borrow a compatible smartphone from a family member or friend to test or verify compatibility in advance, reducing the risk of being unable to use the service due to device compatibility issues.
A: Both have the same price and features. The main difference is the type of SIM.
A: Yes.
In accordance with relevant regulations of Japan’s Ministry of Internal Affairs and Communications, when applying for a Japanese phone number, the contract holder must provide proof of their current address in the country that issued their passport for identity and address verification.
The proof of address must include both the contract holder’s name and current address.
If you would like the eSIM information sent to a hotel in Japan:
Please provide both:
① Hotel reservation confirmation showing the contract holder’s name and stay dates
② Proof of current address
※ eSIM activation information will be sent by email. No physical SIM card will be shipped.
Once the verification of your passport + proof of address is completed, we will begin the eSIM activation process.
Activation is usually completed on the same day or the following day, between 10:30 and 18:30 Japan Time (JST).
Fee: JPY 2,200 (tax included)
Breakdown: JPY 2,000 service fee + JPY 200 tax
When do I need to request an eSIM reissue?
Information required for the application:
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
🅰️ No. JB Voice SIM does not incur any additional data charges, whether you use it in Japan or overseas.
📶 Mobile data service is available in Japan.
・You will receive high-speed data according to your subscribed plan（1GB–50GB）.
・After your high-speed data allowance is used up, your connection will not be disconnected. The speed will automatically be reduced to 200kbps, and you can continue using the internet.
💬 Examples:
LINE text messages, emails, and simple web browsing can still be used.
📢 Internet Settings in Japan
After arriving in Japan:
🍎 iPhone: You need to download the Configuration Profile.
🤖 Android: You need to configure the APN settings.
📞 Outside Japan, only the following services are available:
✅ Voice Calls and SMS
❌ Mobile data (internet access) is not available overseas.
Therefore:
・Whether mobile data is turned ON or OFF
・Whether you are connected to Wi-Fi or not
No international data roaming charges will occur.
📢 How to Use Overseas
After receiving the SIM card overseas:
Simply insert the SIM card into your smartphone to use voice calls and SMS.
❌ Do not download the Configuration Profile.
❌ Do not configure the APN settings.
This prevents your smartphone from attempting to establish mobile data communication.
