Connecting Businesses Across Borders.
Next-Generation Communication Infrastructure.
C.T.S Co., Ltd. is a telecommunications provider (Notification No.: A-01-17459) offering communication services optimized for foreign residents in Japan and corporate clients. Using lines from Japan's four major carriers, we strongly support business growth and people's daily lives with high-quality, stable networks.
“ Providing connectivity solutions across Japan to deliver a seamless experience for everyone.
C.T.S Co., Ltd.
Est. 2019 C.T.S Co., Ltd.
About Us
We remain committed to meeting our customers' needs and continuing to evolve as a leading telecommunications provider.
C.T.S Co., Ltd.'s
Business Domains
From welcoming foreign personnel to corporate communication infrastructure, we provide optimized telecom and device solutions tailored to your business needs.
Mobile Connectivity for Foreign Residents
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.
Corporate Solutions
We propose communication solutions optimized for corporate clients, with stable lines, centralized communication cost management, and professional technical support.
Devices
We offer a wide range of the latest smartphones and mobile WiFi routers that are fully compatible with Japan's communication networks and meet strict quality standards.
Latest
Announcement
Latest news, press releases, and important announcements from C.T.S Co., Ltd.
2026.07.25
How to Add TikTok Shop Affiliate Links to Your Videos
2026.06.27
Best Japan eSIM for Tourists 2026: Plans Compared
2026.06.27
Japan SIM Card vs eSIM vs Pocket WiFi: Which Should You Choose? (2026 Guide)
Company Profile
Overview
Introducing basic information about C.T.S Co., Ltd., partner companies, and various licenses.
Essential Information & Building Trust at C.T.S
- Company Name
- C.T.S Co., Ltd. (CTS Co., Ltd.)
- Founded
- August 5, 2019
- Location
- 401 Kowloon Building,
2-41-9 Namiki, Kawaguchi-shi, Saitama 332-0034
Key Partners Co-Creating Business Value
- SoftBank
- NTT Docomo
- KDDI au
- Rakuten
Licenses & Permits Demonstrating Trust and Reliability
- Telecommunications Business
Notification Number - A-01-17459
- Secondhand Dealer License
- Saitama Prefectural Public Safety Commission
License No. 431030070084
Contact Us
Contact Us
We prioritize flexible, dedicated customer service.
Please feel free to contact us anytime.
Inquiries
Phone Inquiries
Business Hours: 9:00–19:00 (Closed Sun/Holidays)
Website Inquiry
CONTACT