C.T.S Co., Ltd. — Japan & Global eSIM Services

Japan & Multi-country eSIM Plans

From Japan to the Entire World.
With Just a Single QR Code, Instant Access to Multi-Country eSIM.

Reliable eSIM connectivity for Japan, Asia, Europe, North America, and worldwide travel.

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Choose the right eSIM for your destination, travel dates, and data needs.

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WHY CHOOSE C.T.S ESIM

Why C.T.S eSIM is 3 Compelling Reasons to Choose Us

Covering Japan, Asia, Europe, North America, and worldwide tours. We provide flexible multi-country eSIMs perfectly fitted to your itinerary.

01 | INSTANT QR CODE

Instant QR code delivery

Your QR code arrives by email immediately after your order. Scan it and connect without replacing a physical SIM.

02 | 5G/4G HIGH SPEED

Fast 5G/4G connectivity

Multi-carrier coverage helps keep you connected in major cities, on trains, and throughout your trip.

03 | 24/7 MULTILINGUAL SUPPORT

24/7 support and secure payment

Multilingual support and trusted payment options help you travel with confidence.

“ A seamless eSIM solution connecting Japan and the world, with instant connectivity across borders.

C.T.S Global eSIM Solution

Est. 2019 C.T.S Co., Ltd. (Telecommunications Operator)

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About C.T.S Co., Ltd. (eSIM Business)

C.T.S Co., Ltd. is a registered telecommunications operator established in Kawaguchi, Saitama Prefecture, in 2019. In addition to foreign tourists, international students, and expatriates visiting Japan, we provide eSIM services without a contract to customers travelling overseas from Japan.

With no need to replace a physical SIM, simply scan a QR code to use communication plans smoothly according to your itinerary, including Japan, multi-country Asia, Europe, North America, and worldwide plans.

In Japan, we support high-quality networks such as SoftBank, NTT Docomo, KDDI au, and Rakuten Mobile. For overseas travel, we offer country, regional, and multi-country plans based on your destination, number of days, and required data capacity.

With multilingual customer support 24 hours a day, 365 days a year, and convenience-store cash payment (SmartPit), even first-time eSIM users can apply with confidence.

ESIM FREQUENTLY ASKED QUESTIONS

Frequently Asked Questions & eSIM FAQ

Answers to common questions regarding Japan eSIMs, international plans, setup guides, and technical support.

Q1 What is an eSIM, and how is it different from a physical SIM?

An eSIM is a digital SIM built into your device. There is no card to replace or delivery to wait for—scan the QR code sent by email to get connected.

Q2 Do I need identity verification to buy a data-only eSIM?

No identity documents are required for data-only eSIM plans. After ordering online, you can receive the QR code and start using the plan.

Q3 Can I buy an eSIM without a Japanese credit card?

Yes. International credit cards and other supported payment methods are available.

Q4 Does the eSIM support tethering or hotspot?

Yes. C.T.S eSIM plans support tethering so you can share data with a laptop, tablet, or another phone.

Q5 Can I keep my existing phone number and messaging apps?

Yes. Add the eSIM as a secondary line and keep your primary SIM active for SMS and your existing messaging accounts.

Q6 What is a multi-country eSIM?

It is one data eSIM that works across multiple countries or regions, making it convenient for a multi-stop itinerary.

Q7 Do I need to reinstall the eSIM when I change countries?

Usually not, when your destination is included in the same regional plan. Check the covered countries, validity, and data allowance before travelling.

Q8 Can you help me choose a plan for my itinerary?

Yes. Tell us your destinations, travel dates, expected data use, and whether you need hotspot support, and we can recommend a plan.

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