Ninja WiFi eSIM – Review & Full Test 2026

🌍

Countries covered

1 countries

💶

Starting at

19,00 €

📶

Network

5G

📊

Data

5 GB – 100GB

❌

Calls/SMS

No

🌐

App

No

Nationwide coverage in Japan on Docomo 5G and SoftBank 4G/LTE.

Ultra-simple activation via QR code without dedicated app.

Flexible plans from 5GB/5 days to 100GB/31 days starting at 19€.

Hotspot allowed to share with multiple devices.

English business hours support via email/phone.

Destinations & coverage

Ninja WiFi offers eSIMs exclusively for Japan, with nationwide coverage on the best local networks.

By region

Key points

✅

Advantages

  • ✓ Premium local networks for fast and stable speeds everywhere in Japan.
  • ✓ 100% online purchase and activation, even after arrival.
  • ✓ No physical return required for eSIMs.
  • ✓ Transparent pricing with no hidden fees.
  • ✓ Perfect hygiene, zero physical contact.
⚠️

Disadvantages

  • ✗ Coverage limited to Japan only.
  • ✗ No mobile app for management.
  • ✗ Support not 24/7, business hours only.
  • ✗ No calls/SMS included, data only.
  • ✗ Requires unlocked eSIM smartphone.

Customer reviews

tripadvisor

4/5

“

Perfect connection throughout Japan, fast activation via QR code, no issues during the entire stay. Recommended for tourists.

November 1, 2025

blog_review

4/5

“

Excellent speed for streaming and browsing, smooth tethering, quick reconnection after subway outages.

April 1, 2025

tripadvisor

5/5

“

Impeccable service, reliable and fast WiFi, perfect for intensive use.

March 1, 2025

Description

Ninja WiFi, a subsidiary of Vision Inc., offers eSIMs for tourists visiting Japan, with data plans from 5GB to 100GB for 5 to 31 days, at a minimum price around 19€. Based on the powerful Docomo (5G) and SoftBank (4G/LTE) networks, these eSIMs are activated via QR code sent by email after online purchase. No app required, compatible with most unlocked eSIM smartphones. Perfect for solo travelers or groups seeking simplicity, allowed hotspot, and support in English, although limited to Japan only.

How it works

Confirm your smartphone is eSIM compatible and unlocked via the Ninja WiFi site.

Select a plan on ninjawifi.com, pay by card and receive QR instructions by email.

Follow the email to issue the activation QR code.

Go to Settings > Cellular > Add eSIM > Scan QR code.

In Japan, select the Ninja WiFi eSIM for mobile data and enable roaming.

Connect, activate hotspot if needed, track usage via phone settings.

⚠️ If it fails

✅ Check stable internet connection, eSIM compatibility, and try manual entry. Contact [email protected].

✅ Toggle airplane mode on/off, select data eSIM, enable data roaming, restart device.

✅ Check if data limit reached (throttled to 128kbps), avoid peak hours or excessive use.

Alternatives

FAQ

Opt for a 20GB/7 days plan around 35€ on SoftBank or Docomo, sufficient for browsing, maps, and moderate streaming.

Yes, tethering is allowed to share the connection with tablets or laptops.

Yes if eSIM supported and unlocked (iPhone XS+, Pixel 3+, recent Samsung). Check on the site.

Free cancellation 4 days prior, otherwise fees apply. Refund via card, minus protection fees if taken.

Use your phone's data stats or monitor via the Speedtest app to avoid overages.

Yes, extensive coverage via Docomo 5G and SoftBank 4G, including rural areas.

Check the site for seasonal promotions; no specific MYBESTSIM code found currently.

Company info

Legal name: Vision Inc.

Founders: Kenichi Sano

Address: Chamerstrasse 172, 6300 Zug, Switzerland

Email: [email protected]

Website: https://ninjawifi.com/en

Support

Business hours

email, phone

Accepted payments

Visa, Mastercard

Platforms

Web

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