The default settings are as follows:
Network Password: 1234
PIN Code: 0000
⚠️ We recommend changing the password according to your needs after use to improve security.
Archives FAQs
Can I use it together with Wi-Fi?
🅰️ Yes, you can use them together.
You can use JB Voice SIM and Wi-Fi at the same time depending on your needs.
・Use Wi-Fi for internet access
・Use the SIM card for voice calls and SMS
Flexible and convenient!
How to Use Your SIM Card After Receiving It
✅ Basic Usage (Voice Calls / SMS)
Simply insert the SIM card into your smartphone, and you can immediately use voice calls and SMS!
Your smartphone will automatically display your Japanese phone number, making it very convenient 👍
📞 Voice Call & SMS Settings
If you only use voice calls and SMS after inserting the SIM card:
You do not need to connect to Wi-Fi.
You do not need to configure mobile data settings.
📶 Mobile Data Settings (For Use in Japan)
If you want to use mobile data:
iPhone: You need to download the configuration profile.
Android: You need to manually configure the APN settings.
Can I choose a phone number for the voice SIM?
🅰️With JB voice SIM, you cannot choose your phone number. The phone number will start with 080 or 070.
Can I receive Taiwan calls and SMS for free while in Japan?
Yes, you can use this service if the following conditions are met:
✅ Your smartphone is connected to Wi-Fi
✅ The Wi-Fi Calling function is enabled
✅ You are using a supported device (iPhone / Android)
✅ Your SIM card remains active (not suspended or cancelled)
💰 Charges (Important)
Wi-Fi Calling is treated as if you are using the service in Taiwan.
📞 Making calls
・Calling a Taiwan number → Taiwan domestic call charges
・Calling a Taiwan mobile number → Taiwan domestic rates
・Calling overseas (e.g., Japan) → International call charges
👉 No international roaming charges will apply
📲 Receiving calls
・Receiving calls from Taiwan → Free (same as receiving calls in Taiwan)
🌟 Benefits
・Good call quality when the Wi-Fi connection is stable
・You can make and receive calls without enabling international roaming
How to check my mobile data usage?
【 iOS Device】
🌸View Used Mobile Data
“Settings” ➔ “Cellular”
➔ “Current Period” shows the total mobile data usage for the current period.
Scroll down to see the mobile data usage for individual apps.
🌸Reset Statistics Before Viewing
“Settings” ➔ “Cellular”➔ scroll to “Reset Statistics” to reset the mobile data usage for the “Current Period” to 0. 📢If you want to view the mobile data usage for a different SIM, please first switch the “Cellular Data” SIM.
【 Android Device】
The Android system may have different screens and operation methods depending on the brand and model. Here, we will explain how to check mobile data usage using the Galaxy A55 as an example.
🌸View Data Usage
“Settings”➔”Connections”➔”Data usage”
You can view the total amount of mobile data used in the current billing cycle.
🌸Set Billing Cycle Before Viewing Statistics
“Settings”➔”Connections”➔”Data usage”➔”Billing cycle and data warning”➔to reset the mobile data usage statistics.
Proof of Address Upload
In accordance with the regulations of Japan’s Ministry of Internal Affairs and Communications (MIC), applicants for a Japanese phone number are required to submit their passport and proof of their current residential address.
＜eSIM will be delivered by email＞
＜Physical SIM cards can only be shipped to the address shown on the proof of address＞
■ Proof of Current Residential Address
Please provide **one** of the following documents showing **both the subscriber’s name and current residential address:
・Driver’s license, certificate of residence, or a tax-related document issued by a government authority
・Utility bill (Electricity bills / Gas bills / Water bills / Telephone bills, etc.)
・Credit card statement or bank statement, etc.
■ If you would like the SIM card to be delivered to a hotel in Japan, please provide **both** of the following:
1. Hotel reservation confirmation showing the subscriber’s name and check-in date
2. Proof of current residential address
※ Shipping to Japan forwarding services or relatives’/friends’ addresses is not allowed
Device Compatibility for International Roaming
📢 Normal Usage Within Japan: Compatibility Guide for docomo International Roaming VoLTE Calls
As 3G networks have been shut down in Japan and many other countries, you must use a VoLTE-compatible phone model to utilize docomo’s international roaming voice call services.
⚠️ Please note that certain phone models may completely fail to work overseas, or may only be able to receive SMS while being entirely unable to make or receive voice calls.
💡 Reminder: For Android devices, actual compatibility may vary depending on the country of manufacture and regional hardware variations.
■ ASUS
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| ASUS ROG Phone 8、ASUS ROG Phone 9 | 〇 | 〇 | ||
| ASUS ZenFone Max Pro (M2) | 〇 | 〇 |
■ Google Pixel
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| IGlobal Version | 〇 | 〇 |
■ HUAWEI
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| HUAWEI Mate 50 Pro | 〇 | 〇 |
■ iPhone
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| 16e、17e physical SIM model | MHRW4ZP/A TW/TH/VN | ❌ | 〇 | Unable to make calls while overseas, but SMS can be received after configuring the APN. |
| 6 、7、X、11、12、13、14、15、16、17 Series | Global Version | 〇 | 〇 |
■ OPPO
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| OPPO Reno14 Pro | 〇 | 〇 | ||
| OPPO A79 5G | CPH2557(Global Version) | 〇 | 〇 |
■ Samsung
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| Samsung Galaxy S Series | TW、US、HK | ❌ | 〇 | |
| Samsung Galaxy A Series | TW | ❌ | 〇 |
■ SHARP
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| SHARP AQUOS wish5 | 〇 | 〇 |
■ SONY
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| Xperia 1 V | XQ-DQ72 TW/HK | 〇 | 〇 |
■ vivo
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| vivo V29 5G、vivo V40 5G、vivo Y55、vivo X300 | 〇 | 〇 |
■ Xiaomi
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| Redmi 12C、Note 11 Pro+ 5G、Redmi Note 12 Pro+ 5G | 〇 | 〇 | Dial ##86583## directly to enable or disable the VoLTE calling function. | |
| Xiaomi 12T | 〇 | 〇 | ||
| POCO F8 Ultra | 〇 | 〇 |
When does the validity period start counting?
- After purchase and receiving the activation URL, the validity period does not start counting immediately. You can open the URL to check the activation information in advance.
- After pressing the “Issue” button and generating the eSIM activation QR code, if you do not install or use the eSIM, the validity period will automatically start counting from the 3rd day after the QR code is issued.
- After adding the eSIM to your smartphone, the validity period will not start while you are outside Japan. The validity period begins when you arrive in Japan and your device connects to a Japanese mobile network.
※ However, if you have not arrived in Japan by the 3rd day after the QR code is issued, the validity period will start automatically.
How many GB of a product should I purchase?
🅰️ Please refer to the common questions in the “Pre-purchase Check” such as “How many GB are needed in one day?“, “How long can 1GB last for internet usage?” and “How to check my mobile data usage?” to make your decision.
📢 When the high-speed data you purchased runs out, your speed will not be cut off. Instead, it will be reduced to 200kbps, and you can still send text messages normally.
📢 You can always add more data capacity through this website. For urgent requests on holidays or nights, please contact customer service for immediate assistance.