This product is a service for customers residing outside of Japan.
In accordance with the regulations of the Ministry of Internal Affairs and Communications (MIC), individuals residing in Japan are not eligible to apply for this product (service with a Japanese phone number).
FAQ Category Important Notes Before Purchase
Which countries can JB Voice eSIM／SIM be used in?
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
Will I be charged extra for data usage?
🅰️ No. JB Voice SIM does not incur any additional data charges, whether you use it in Japan or overseas.
🗾 Use in Japan
📶 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.
🌐 Overseas Roaming (Countries Outside Japan)
📞 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.
Any SIM restrictions？
【 iOS Device】
「settings」➔「General」➔「About」➔「Carrier Lock」 ➔No SIM restrictions
【 Android Device】
You cannot determine this directly from the mobile phone. Please check with the place of purchase or the carrier you have a contract with.
SIM lock regulations vary by country. In Taiwan, most phones are not SIM-locked.Devices purchased in countries like Japan or the United States are more likely to have SIM lock issues.
📢If you have used SIM cards from different countries or carriers, the device is likely not SIM-locked.
Device Compatibility for International Roaming
📢 Normal Usage Within Japan ; Compatibility Guide for docomo International Roaming VoLTE Calls
【Warning】If you only intend to use the service for verifying Japanese websites while overseas, please note that Samsung devices, iPhone 16e, Phone 17e/Air, and iPhone 18 series may not work properly overseas.
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.
⚠️ Some devices may be completely unable to use the service overseas, while others may only be able to receive SMS and may not be able to make or receive calls.
💡 Actual compatibility may vary depending on the country or region where the device was manufactured.
■ 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 | ||
| ASUS Zenfone 9 | AI2202 | 〇 | 〇 |
■ Google Pixel
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| Global 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/Air 、18 Series | MHRW4ZP/A TW/TH/VN Global Version（i18） | ❌ | 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 5G | CPH2737 | 〇 | 〇 | |
| OPPO Reno14 Pro | 〇 | 〇 | ||
| OPPO A79 5G | CPH2557(Global Version) | 〇 | 〇 |
■ Motorola
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| Motorola Edge 60 Fusion | 〇 | 〇 |
■ Samsung
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| Samsung Galaxy S Series | TW、US、HK、SG、AU | ❌ | 〇 | |
| Samsung Galaxy A Series | TW、US、HK、SG、AU | ❌ | 〇 |
■ SHARP
| Model Name | Model Number | Roaming VoLTE Calls | Roaming SMS | Notes |
|---|---|---|---|---|
| AQUOS wish5 | SH-M32TW | 〇 | 〇 | |
| AQUOS R9 | SH-M28TW | 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 (V2250)、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、POCO X8 Pro Max | 〇 | 〇 |