HD TELECOM Explanation of Important Matters
Effective date:
Vietnam Bussan Co., Ltd.
Date established: September 28, 2026
This document sets out important matters for you to check before applying for HD TELECOM telecommunications services, including charges, communication quality, identity verification, cancellation and traffic management. Where a plan has its own conditions, what is shown on the application screen, price list or product page takes precedence.
1. Service Provider
Company name: Vietnam Bussan Co., Ltd.
Service name: HD TELECOM
Address: Century Bldg. 2F, 1-16-18 Hyakunincho, Shinjuku-ku, Tokyo 169-0073, Japan
Representative: Duong Anh Duc, Representative Director
Phone: 03-6789-8553 (hours: 10:00–19:00 Japan time; closed Wednesdays and Sundays)
Email: support@hdtelecom.jp
Website: https://www.hdtelecom.jp
Telecommunications business notification no.: A-06-22505
2. Services Provided
We provide data SIMs and eSIMs, the sale and rental of pocket WiFi devices, and related services. The network type, coverage, data allowance, usage period, compatible devices and other details are shown on each product page.
Data-only SIMs, eSIMs and pocket WiFi devices cannot be used for voice calls or emergency calls (110 for police, 118 for the coast guard, 119 for fire and ambulance).
3. Charges and Initial Costs
Monthly charges, initial fees, device charges, SIM/eSIM issue and reissue fees, shipping fees, costs that arise on cancellation and any other amounts you pay are shown, including tax, on the application screen and price list for each plan.
Shipping: free (within Japan)
Other required costs: bank transfer fees (paid by you). Cash on delivery fee: free (at present). Pocket WiFi device: ¥9,900 (tax included) if you buy it, or a ¥6,600 deposit (tax included; refunded after the device is returned) if you rent it.
Administration fee: ¥3,300 (tax included) per SIM, eSIM or pocket WiFi line when you sign up. It is not charged for the 12-month prepaid SIM. SIM/eSIM reissue fee: ¥3,300 (tax included).
4. Payment Methods and Timing
You can pay by bank transfer or cash on delivery (paid when your SIM card or pocket WiFi device is delivered). The payment timing for each method is shown on the application screen. For recurring charges, the billing date and renewal date are shown before you apply and on the final confirmation screen.
Monthly charges from the second month onwards: please follow the payment notice we email you on or after the 25th of each month, and pay the following month's charge by bank transfer by the last day of the current month.
5. Service Start and Delivery
eSIM: if we confirm your payment during business hours (10:00–19:00, excluding Wednesdays and Sundays), we normally email you the QR code and setup information the same day. Payments made outside business hours or on days we are closed are handled on the next business day.
SIM cards and pocket WiFi devices: we ship after confirming your payment (for cash on delivery, after confirming your order), and delivery within Japan normally takes 1–3 business days.
Delivery may be delayed because of stock availability, shipping, screening or other reasons.
6. Identity Verification
To prevent fraudulent use and to verify identity where the law requires it, we may ask you to submit images of the front and back of your identity document, an image showing both you and your identity document, your name, your address in Japan, your email address, your contact details and other necessary information. Services with voice calls or SMS are not provided until identity verification under the applicable laws and our own procedures has been completed.
Only people aged 18 or over may apply for or use our services.
7. Speed and Quality
Our services are provided on a best-effort basis. Maximum speeds are not a guarantee of actual speeds. Speed and quality vary depending on location, time of day, signal conditions, device, network congestion, the sites you connect to and other factors.
8. Data Allowances and Traffic Management
Data caps, speeds after the cap is reached, top-ups, usage periods and other details are shown for each plan. If we offer an unlimited plan and manage its traffic for stable network operation, fair use or other reasonable purposes, we will make those conditions clear before you apply.
9. Coverage and Compatible Devices
Coverage depends on the network coverage area of the carriers whose networks we use. Please check compatible devices, frequency bands, APN settings and other details on the product page. Even with a compatible device, you may not be able to connect in some environments.
10. Order Cancellation, Returns and Contract Cancellation
For mail-order purchases, the conditions for withdrawing an application, returns, order cancellation and contract cancellation are as shown for each product and service.
Cancellation before shipping (for eSIM, before the QR code is issued): we refund the full amount. After shipping (for eSIM, after the QR code is issued), we cannot accept cancellations, returns or refunds for personal reasons (except for defects on arrival or delivery errors attributable to us).
Minimum term: 12 months for monthly data SIMs, monthly eSIMs and pocket WiFi (2 months for the Rakuten network 300GB plan, whether SIM or eSIM). Cancellation fee if you cancel within the minimum term: ¥9,500 (per line or device; no cancellation fee for the Rakuten network 300GB plan). After the minimum period, the contract continues automatically month by month until you ask to cancel.
12-month prepaid SIM: there is no minimum term and no cancellation fee. If you cancel partway through the usage period, we do not refund the charge for the unused period. It does not renew automatically when the usage period ends.
Return deadline for rental devices: the device must reach us within 10 days of the contract end date. Return method: by post (you pay the return postage). After we receive the device and check that it works, we refund the ¥6,600 deposit by bank transfer within 14 days (minus any unpaid charges). If the device is not returned by the deadline, or if it is lost or faulty (not working properly), the deposit is not refunded.
How to cancel: contact us by email (support@hdtelecom.jp) or phone (03-6789-8553, hours: 10:00–19:00 Japan time; closed Wednesdays and Sundays). If you contact us by the 15th of the month, your contract ends on the last day of that month. The monthly charge for the month you cancel is calculated pro rata on a daily basis. You do not need to return the SIM card when you cancel.
11. Rental Devices
Rental devices are devices that we have purchased and manage in our name, or other devices that we are legally able to lend. Please look after them properly and return them by the specified deadline when the contract ends. Charges for loss, damage or non-return: the deposit (¥6,600) is not refunded.
12. No Resale
Without our prior consent, you may not resell, commercially resell, transfer or sublet the services, SIMs/eSIMs, rental devices or similar to a third party, or let a third party use them in your name.
13. Suspension and Termination by Us
If charges are unpaid, identity verification is incomplete, false information has been given, there is fraudulent use or resale, there is a serious effect on the network, or any other ground set out in the Terms of Service applies, we may suspend the service or terminate the contract.
14. Contact
HD TELECOM Customer Support
Email: support@hdtelecom.jp
Phone: 03-6789-8553
Hours: 10:00–19:00 Japan time; closed Wednesdays and Sundays
15. Related Terms
In addition to this document, please read the HD TELECOM Terms of Service for Telecommunications Services, the Privacy Policy, the Notice under the Act on Specified Commercial Transactions and the individual conditions for each plan.
This translation is for reference only; the Japanese version is the legally binding text.