✅ With the same price, you can choose between a "Physical SIM" or an "eSIM".
🔥 ONLY NOW! SPECIAL DEALS!
Application deadline: until 12:00am March 16, 2026
Service Details
This service provides mobile data, voice calls, and SMS with a Japanese phone number.
🌐
High-speed Data: Web browsing, video streaming, and social media.
📞
Voice Calls: Domestic calls within Japan. *Separate fees may apply if used.
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SMS: Send and receive text messages. *Separate fees may apply if used.
Sun-Net Voice SIM Service
Initial Fee 3,300 yen
Monthly Data Capacity 50 GB
Monthly Usage Fee 2,750 yen
✅ Available in Physical SIM or eSIM
(Same price for both options)
Minimum Contract Period 4 Months ~
Payment Method
① Monthly Credit Card Payment
The monthly usage fee is deducted automatically from your credit card.
- Billing: Around the 10th of every month.
- Admin Fee: 154 yen applies from the 2nd bill.
⚠️ The first bill is usually higher, as it includes the initial fee and charges for the first 2–3 months.
② One-time Credit Card Payment
Make a one-time payment for all basic fees.
📌 No Prorated Billing: We charge the full monthly fee regardless of which day you start or cancel.
Important Notes Regarding Service Fees
- The monthly usage fee includes data usage only.
- Receiving domestic calls and SMS is free of charge.
- Additional charges apply to outgoing voice calls, domestic outgoing SMS, and international SMS (sent and received).
- Call and SMS charges are calculated based on actual usage and will be automatically deducted three months after the month of usage.
| Item |
Fees |
Remarks |
| Monthly usage Fee |
As specified in the plan |
Data usage only |
| Domestic Calls |
23 JPY / 30 sec
*Exceptions apply (e.g., 0570 numbers) |
Usage-based charges |
| SMS |
Domestic: From 5 JPY
International: From 150 JPY |
Varies by character count |
ℹ️
For details on SMS rates and other domestic call charges, please visit:
⇒ Visit Link
Credit Card Registration
■ 【IMPORTANT】 Automatic Billing Setup
Register a credit card to automatically pay monthly fees and any call/SMS charges.
💳
STEP 1
Pay 1st invoice via ZEUS link
🛡️
STEP 2
Card info is securely saved
✨
FUTURE
Automatic billing (if charges occur)
Billing Date: The 10th of every month.
※ Voice/SMS will be billed three months after the usage month.
※ A billing admin fee of 154 yen (tax-in) applies from the 2nd installment.
Service Restrictions
⚠️ Important Information
❌
SIM-Locked Devices
This service only works on SIM-free (unlocked) devices. Please ensure your device is unlocked in advance.
❌
International Calls
International calling functionality is not available with this SIM.
❌
Tethering
Tethering (Personal Hotspot) for sharing data with other devices is not supported.
❌
MNP (Porting Out)
MNP reservation numbers cannot be issued for porting your number to other carriers.
❌
Changing SIM Types
Switching between Physical SIM and eSIM while keeping the same number is not possible.
Understanding the Differences: Physical SIM vs. eSIM
| Item |
Physical SIM |
eSIM |
| Form Factor |
Physical IC card inserted into device |
Built-in chip inside device (Digital) |
| Device Change |
✔ Easy
Move the SIM from the old device to the new one. |
⚠ Process
A paid procedure is required to issue a new QR code. |
| Reissue SIM |
・How to register: Online registration form.
・Procedure Fee: 3,300 yen
(Shipping fee:550yen)
・Phone Number: Remains the same
⏳ Processing Time: 6 to 10 days
* Service is completely unavailable during this process.
|
・How to register: Online registration form.
・Procedure Fee: 1,100 yen (tax-in)
(New QR code sent by email)
・Phone Number: Remains the same
⏳ Processing Time: 10 to 14 days
* Service is completely unavailable during this process.
|
eSIM Important Notes
eSIM is convenient but has several critical rules regarding usage and re-issuance:
1. Device Compatibility
⚠️ Please verify that your smartphone supports eSIM before registering.
2. QR Code Usage
• ❌ Single Use Only: Can be scanned only once during setup.
• ❌ No Re-installation: Cannot be reused once installed or deleted.
Network Quality and Data Communication
■ Connection Speed and Service Area
● Best Effort Service
This service is provided on a "best-effort" basis. Actual communication speeds may vary depending on your location, the time of day, and network congestion.
● Bandwidth Control
To ensure fair communication quality for all customers, bandwidth control (speed restriction) will be implemented during the following peak hours: Restricted Hours: 12:00 PM – 1:00 PM / 4:00 PM – 12:00 AM (Midnight)
■ Regarding the Tethering Function
The Sun-Net SIM does not support the tethering function (Personal Hotspot) for sharing data with other devices.
■ Data Limit and Speed Throttling
If you exceed your monthly data allowance, your connection speed will be limited to a maximum of 128kbps.
- Service during restriction: While you can still send and receive text messages, this speed is not suitable for watching videos or browsing image-heavy websites.
- Restoration: Your normal data speed will be automatically restored on the 1st day of the following month.
■ Data Capacity Management and Plan Changes
- Data Rollover: Unused data cannot be carried over to the next month. Any remaining data at the end of the month will expire.
- Plan Changes and Data Top-up: Please be advised that monthly data plan changes and additional data top-ups are currently unavailable.
Handling of Overdue Payments
※ Failure to confirm payment will result in service suspension or contract termination.
■ Late Payment Fees and Service Suspension
If payment is not confirmed by the due date, a late payment fee will be charged. If non-payment continues, we may temporarily suspend your SIM services.
■ Service Restoration
To restore service, the following conditions must be met:
- Full settlement of the outstanding balance.
- Payment of the Reconnection Fee: ¥1,320 (tax-in).
- Restoration typically takes 1 to 3 business days after payment confirmation.
■ Regarding Contract Termination
If no action is taken after reminders, we will carry out contract termination with the following consequences:
- All outstanding balances must still be settled after termination.
- The terminated SIM card cannot be restored.
- A new application will be required, resulting in a new phone number.
Procedures for Continuing Service (Contract Extension)
※ This service does not renew automatically. Upon expiration, the service will be automatically terminated.
If you wish to continue using the service, please ensure you complete the contract extension procedures within the specified deadline.
■ How to Apply for a Contract Extension
Please complete the extension procedures via our official website at least one month before your contract expires.
■ Important Notes Regarding Non-Renewal
If extension is not confirmed, your SIM will become unusable after the expiration date. Re-using the service will require a "New Application" under these conditions:
- New Administrative Fee: A SIM issuance fee of ¥3,300 (tax-in) will be charged.
- Phone Number Change: You cannot keep your current number. A new number will be assigned.
- Service Interruption: There will be a period without service while the new SIM is processed.
Restoring service after expiration is treated as a "New Contract". It is impossible to transfer previous usage data or settings.
Please complete the procedures within the deadline to avoid service interruption.
Cancellation Procedures
■ Cancellation Procedures
● Automatic Expiration
The contract will automatically terminate at the end of your subscription period. No cancellation procedures are required, and no cancellation fees will be charged.
● Early Termination
If you wish to cancel before the end of your contract, please complete the process via our official website at least one month prior to your desired cancellation month.
■ Regarding the Initial Contract Cancellation
You may cancel this contract in writing within 8 days, starting from the day you receive the contract documents.
- Cancellation Fees: No contract termination penalties will be charged if cancelled within the 8-day period.
- Customer Responsibilities: You are still responsible for fees incurred up to the date of cancellation:
- Service usage fees (data, voice calls, etc.)
- Initial fee
Ready to get started?
Please make sure you have checked all notes on this page before submitting your application.
📅 How to receive the SIM?
💳 Physical SIM
・If you complete the registration and payment by March 16, you will receive the SIM when checking in at the dormitory.
・If you complete registration and payment after March 16, please join our support session on April 7 to receive your SIM.
・Please note that even if you select a start date in March, the actual service will begin on or after April 1st. We appreciate your understanding.
📱 eSIM
The QR code will be sent via email 1–2 days before your requested start date, after completing registration and payment.
✨ SIM support Session
On 4/7/2026 (Tue) @ Saitama University
Join us for full support! We will explain all Sun-Net SIM plans and provide hands-on setting support to ensure your connection is working perfectly.
Don't miss it!
Contact Us
For inquiries regarding Internet connection and services in general, please use the email form below or free-dial number.
Contact us by phone
0120-336-326
OPEN / WEEKDAY 10：00～18：00
＝＝＝＝＝Sun-Net Service (Sunrise Corporation)＝＝＝＝＝
DKK Higashi-Nihombashi Building 4F
2-14-1,Higashi-Nihombashi,Chuo-ku,Tokyo
TEL:0120-336-326
FAX:03-5822-2342
E-mail:info@sunrise-net.co.jp
Business Hours: Weekdays (10:00am-6:00pm)
