eSIM Data 4G/5G – 100GB/month, monthly prepaid, dedicated for internet access — SB (SoftBank)
SB (SoftBank) eSIM, 100GB per month, using high-speed 4G/5G networks. Instantly activated via QR code – no physical SIM required, no need to visit a store.
✔ Initial fee (activation + first month): ¥5,500
✔ Monthly charge (from the 2nd month onward): ¥3,600, payment due on the 20th of each month
✔ Data allowance: 100GB/month
✔ Activation: Instant via QR code – no physical SIM required
✔ Supported network: SB 4G/5G, stable coverage across Japan
✔ Compatible devices: iPhone, Samsung Galaxy, Google Pixel, Sony Xperia, Oppo, Xiaomi, and other eSIM-compatible devices
✔ Customer support: English and Vietnamese available
✔ Target users: Those who need stable data for streaming, video calls, gaming, daily web browsing
SoftBank Japan eSIM 100GB/Month: Instant 4G/5G Data
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Get online in 3 simple steps
Instant digital delivery. Scan your QR code and connect in minutes.
Choose your plan
Select your trip duration and data allowance, then checkout online.
Receive your QR code
Receive your digital activation QR code by email within minutes. No shipping wait.
Scan and connect
Scan the QR code in phone settings and get online right after arrival.
What you get
Why choose C.T.S
*Based on our 2026 research comparing contract terms, setup fees, and cancellation policies.
Real people, real eSIMs
Instant setup & helpful support for your stay in Japan.
“Always providing the best support. Truly appreciate the helpful and friendly care.”
Response time was super fast. Whenever I had questions navigating mobile connectivity in Japan, the support team patiently helped me until everything was settled.
“Extremely satisfied with the service. Will definitely recommend to friends needing a SIM!”
Clear registration steps and very polite staff. I feel 100% confident recommending C.T.S to students and co-workers moving to Japan.
“Setup was smooth and ready in minutes. Strong network coverage and great service.”
Followed the simple step-by-step guide and internet was working right away. Rock-solid connection on the nationwide SoftBank network.
“5 stars isn't enough, I'd give 10 out of 5 stars for the extraordinary help!”
When I had a mix-up with the delivery locker at my building, support immediately contacted the courier service to ensure my package arrived safely.
“Pre-order guidance was super helpful and warm. A reassuring 5-star experience.”
They explained the data allowance plans and group bundle discounts clearly so I could make the best choice without hesitation.
Questions before you buy
Need help with compatibility, activation or your QR code?
Japan eSIM. Online in minutes.
No shipping wait. Scan your QR code and connect instantly across Japan.