Japan eSIM
KDDI/au
eSIM travel data plan for Japan — 999 GB of full-speed 3G/4G/5G data on the KDDI/au network, valid for 3 days.
999 GB
Data
3 Days
Validity starts at purchase
3G/4G/5G
Speed
KDDI/au (5G)
Network
This plan starts at purchase: the 3 Days validity begins when you buy it, and it must be installed within the install window. So buy it just before you travel.
Not travelling yet?
Tell us your travel date and we will email you before you go (a week before, or when you choose) with the latest Japan eSIM prices. No account needed.
Plan Details
Japan Unlimited-10Mbps 3Days (KDDI)
Important Information
- Instant delivery via QR code
- No physical SIM card needed
- Keep your existing number for calls
- Data-only plan (no voice calls)
- Sorry, Top-up is not available on this plan — better to buy another plan if you need more data
- Check device compatibility before purchase
- Trip Essentials kit included for Japan — see what's included
Your Trip Essentials kit for Japan
Free with this eSIM. Lands in your dashboard the moment you buy — so you can download maps and prep on wifi before you fly.
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Audio phrasebook 25 essential phrases in Japanese, with native-voice pronunciation
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Weather + forecast Today's conditions in Tokyo, plus a 3-day forecast for trip planning
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Offline-map prep 3 airports, 10 transit systems, 37 landmarks — all one-tap deep links into Google or Apple Maps
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Ride-hail apps 4 local ride-hail options curated for Japan — pre-install the right one before you land