
Mobile Companion eSIM
Japan eSIM: 5G travel data
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About
Your Japan eSIM at a low price, ready before you fly.
Choose your data, pay in the app and install your eSIM at home in 1 minute: you’re online as soon as you land. No subscription, no hidden fees, no SIM card to hunt for at the airport.
THE RIGHT PRICE
• Plans in every size: a few GB for Maps and messaging, much more for video
• Your plan starts at your first connection in Japan, not when you buy it: buy early, you won’t lose a day
• Need more data? Top up the same eSIM in the app
• Our prices next to the big eSIM brands, checked and dated: mobile-companion.com/en/compare
A CONNECTION THAT WORKS
• NTT docomo’s 5G network, with a Japanese IP address: unlike your usual plan abroad, your data doesn’t detour through your home country
• It connects by itself as soon as you switch off airplane mode
• Your usual SIM stays in place for calls and texts
• Share your connection with your other devices
• A real person replies on WhatsApp, 24/7, in English or French
EVERYTHING IN THE APP
• Checks that your phone is compatible before you buy
• Your remaining data and validity at a glance, also in a widget
• An alert when you’ve used half your data, then when you’re running low
• Pay by card or Apple Pay, sign in with email, Google or Apple
• The same account as on mobile-companion.com
HOW IT WORKS
1. Choose your Japan plan
2. Pay securely
3. Install your eSIM at home, over Wi-Fi
4. Land: it connects by itself
A question before or during your trip? Message us on WhatsApp from the app, any time.
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What's New in Mobile Companion eSIM
1.0.9
November 5, 2026
Bug fixes.




