C.T.S 株式会社

Docomo SIM Card Japan – 50GB Data + Unlimited Calls, 4G LTE network

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¥8,000 ¥10,800

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Docomo SIM Card Japan – 50GB Data + Unlimited Calls

Docomo SIM, 50GB data per month with unlimited voice calls, monthly prepaid plan, no contract required. Perfect for international students, foreigners in Japan, and travelers who need both large data and unlimited calling.

✔ Initial fee (SIM issuance + registration + first month): ¥8,000
✔ Monthly charge (from the 2nd month onward): ¥6,280 (tax included)
✔ Billing cycle: 20th–25th of each month
✔ Data allowance: 50GB/month
✔ Voice calls: Unlimited
✔ Contract: Not required
✔ Supported network: Docomo, stable coverage across Japan
✔ Target users: Heavy data users, international students, foreigners in Japan, travelers

Pay today · Monthly ¥8,000

Online in 3 simple steps

No shop visit, no Japanese paperwork stress.

Order in 2 minutes

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

Receive it at home

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

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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When am I charged each month?

You pay ¥5,500 today, which covers activation and your first month. After that the plan is ¥2,850 per month (tax included).

What happens after I use 50GB?

Once you reach 50GB, your connection continues at a throttled speed until the next monthly cycle.

Which devices does it work with?

Compatible with SIM-free smartphones, mobile pocket WiFi devices and tablets supporting Japan LTE bands.

Can I pay in cash?

Cash payment is supported through the payment methods available at checkout.