C.T.S Co., Ltd. - Japan Communication Services

Connect with Japan
At Your Fingertips

Genuine SIMs, eSIMs, and Pocket WiFi — No long-term contract required, with free shipping across Japan. C.T.S Co., Ltd. is a registered Japanese telecommunications carrier headquartered in Kawaguchi, Saitama, and an official partner of SoftBank, NTT Docomo, Rakuten Mobile, and KDDI au. We have served over 100,000 foreign customers since 2019.

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Connecting People Nationwide

From bustling Tokyo to tranquil countryside, we keep you connected everywhere in Japan.

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We provide SIM cards, eSIMs, and Pocket WiFi. With multilingual SmartPit payment support and more, we help foreign customers use a safe and convenient communication environment.

Mobile Connectivity for Foreign Residents

We propose optimized corporate connectivity solutions featuring stable network lines, centralized cost management, and dedicated technical support.

Corporate Solutions

We offer a wide lineup of modern smartphones and mobile Wi-Fi routers that fully support Japanese cellular networks and meet strict quality standards.

Devices

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The Value Delivered by C.T.S Co., Ltd.

A seamlessly connected Japan for everyone.

From ultra-fast 5G SIM cards and long-battery Pocket WiFi to 24/7 multilingual support, see how C.T.S Co., Ltd. supports your life and journey in Japan.

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The Value Delivered by C.T.S Co., Ltd.

A seamlessly connected Japan for everyone.

From ultra-fast 5G SIM cards and long-battery Pocket WiFi to 24/7 multilingual support, see how C.T.S Co., Ltd. supports your life and journey in Japan.

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Mobile Communication

Stay connected everywhere in Japan with flexible SIM and eSIM solutions.

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WiFi & Internet

Reliable mobile and home internet for travel, work, and daily life in Japan.

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Devices

High-quality smartphones and PCs for communication, work, and everyday use.

Supported Payment Methods

Convenience Store Cash Payment

Fully supports SmartPit cash payments at FamilyMart and Lawson stores nationwide. No credit card or Japanese bank account required.

FamilyMart

Lawson

SmartPit Cash 24/7

SmartPit

PAYMENT CODE

1234 5678 9012 3

Valid 24 Hours

Pay Cash at Register

24/7 Convenience Stores

13-Digit SmartPit Code

Easy & Speedy

Foreigner & Traveler Friendly

Why Choose ConnectJP

Why Why Choose Us

At C.T.S Co., Ltd., keeping you connected is always our top priority. As a licensed Japanese telecom carrier, we deliver instant, reliable, and transparent connectivity for students, travelers, and expats in Japan.

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Instant eSIM & Fast Setup

No paperwork or Japanese credit card needed. Get instant QR code issuance and activate high-speed 5G/4G in just a few minutes.

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Direct Tier-1 Carrier Networks

As an official partner of SoftBank, NTT Docomo, KDDI au, and Rakuten Mobile, we provide 99.9% ultra-fast network coverage across all 47 prefectures in Japan.