SoftBank SIM Card Japan – Unlimited Data 4G LTE｜Prepaid Monthly Plan｜No Contract｜High-Speed Internet – Fast Shipping
C.T.S 株式会社

SoftBank SIM Card Japan – Unlimited Data 4G LTE｜Prepaid Monthly Plan｜No Contract｜High-Speed Internet – Fast Shipping

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¥52,500 ¥15,000
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Pay with VISA Mastercard JCB AMEX Konbini Bank transfer Cash on delivery
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Free Nationwide Shipping Across Japan (On Select Products)
Bilingual Customer Support

SoftBank Unlimited Data SIM Card – Monthly Plan

Initial Fee: ¥7,980 (includes registration fee + first month usage)  
Monthly Fee: ¥4,980 (tax included, payment required between the 20th and 25th of each month)  

Enjoy unlimited 4G LTE data across Japan with the SoftBank SIM Card. Designed for travelers, international residents, and anyone who needs reliable, high-speed internet without a contract. Prepaid monthly billing makes it easy and flexible to stay connected.  

✔ Unlimited data – SoftBank 4G LTE network  
✔ Prepaid monthly plan – no contract required  
✔ Quick setup – plug & play, ready to use instantly  
✔ Compatible with most smartphones, Pocket WiFi, and routers  
✔ Wide nationwide coverage across Japan  
✔ Easy online recharge available anytime  
✔ Fast shipping – ready to use upon arrival  

Pay today · Yearly ¥52,500

Online in 3 simple steps

No shop visit, no Japanese paperwork stress.

1

Order in 2 minutes

Pick your plan and pay by card, at a konbini, by bank transfer or cash on delivery.

2

Receive it at home

Your SIM arrives by post with a setup guide in English and Japanese.

3

Insert and go

Put the SIM in your phone or router, follow the APN guide, and get online.

What you get

NetworkSoftBank 4G LTE
High-speed data50GB per month
After 50GBSpeed limit may apply
Calls / SMSData only
SIM sizeNano / Micro / Standard
ContractNone
Monthly payment20th–25th of each month

Why choose C.T.S

C.T.S Data SIM
Typical contract plan
Contract
None
Often required
How to start
Delivered to your door
Visit a shop
Support language
English & Japanese
Mostly Japanese
Payment
Card, konbini, bank, cash
Card or bank account
General comparison. [Verify each row before publishing.]

Real people, real SIMs

Every order is packed by our team in Saitama.

Read all reviews
[Photo: team packing orders]
★★★★★

"A simple way to get connected in Japan."

C.T.S customer · Japan

★★★★★

"Clear setup and helpful support when I needed it."

C.T.S customer · Japan

[UGC: customer connected in Japan]

Questions before you buy

Still unsure? Our team answers in English and Japanese.

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You pay ¥5,500 today, which covers activation and your first month. After that the plan is ¥2,850 per month (tax included).
Once you reach 50GB, your connection continues at a throttled speed until the next monthly cycle.
Compatible with SIM-free smartphones, mobile pocket WiFi devices and tablets supporting Japan LTE bands.
Cash payment is supported through the payment methods available at checkout.

50GB every month. No contract.

¥5,500 today (includes your first month), then ¥2,850 per month.

Prefer no shipping? Japan eSIM from ¥460 →