Japan eSIM · KDDI (au) network
A Japanese mobile line on KDDI (au) — not a roaming plan routed through another country. Install it at home, switch it on in Japan, and your days start when you first connect.
Why local
Roaming eSIMs borrow a Japanese network through a foreign carrier. This eSIM is a Japanese line issued for Japan, so your connection starts and ends here.
Your phone joins a Japanese network as a visitor, and your data is often handed back to the foreign carrier before it reaches the internet.
Your phone joins KDDI as a Japanese line, and your data reaches the internet in Japan.
| Typical roaming eSIM | This eSIM | |
|---|---|---|
| Network | A Japanese network borrowed through a foreign carrier | KDDI (au) line issued in Japan |
| IP address | Often outside Japan | Japanese IP |
| “Unlimited” | Often slowed after a daily allowance | No daily cap on Unlimited 5G (Fair Usage Policy applies) |
| Hotspot | Varies by provider | Included on every plan |
Plans
Three ways to stay online in Japan. Every plan includes hotspot and runs on KDDI (au).
No daily cap and no speed limit on your phone. For heavy maps, video and uploads.
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Unlimited data at up to 10 Mbps. Enough for maps, messaging and HD video.
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A fixed amount of high-speed data to share between your phone and laptop.
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Prices in USD. Any taxes are calculated at checkout.
How days work
Buy and install whenever you like. The clock starts only when your phone first connects to the network in Japan.
Scan the QR code on Wi-Fi before you fly. Nothing is counted yet.
Your first connection in Japan counts as day 1, whatever the time. Each new day starts at 00:00 Japan time, not 24 hours after you connect.
Your last day ends at 23:59 JST (UTC+9). Plans can’t be extended, so pick enough days.
Where it takes you
How it works
Everything happens on your phone. No shop, no pickup counter, no plastic SIM.
Pick a plan and pay. We email you a link to My Page, where your QR code is waiting.
Scan the QR code on Wi-Fi at home. It installs once, so keep it on this phone.
When you arrive, turn the line on and choose it for mobile data. Data roaming can stay off. You’re online on KDDI.
On the ground
From the night before to the last train home.
Before you fly
Food
Shinkansen
HotspotWill my phone work?
Your phone must support eSIM and be carrier-unlocked. It must also support LTE Band 18 or 26, the KDDI bands that carry this line.
Your phone
Please check all four before you buy. Once your QR code is shown, the eSIM can’t be refunded.
Made for smartphones and tablets; routers and other devices aren’t guaranteed. Phones with the same name can differ by region, so check your exact model number.
FAQ
On your phone, yes: no daily cap and no speed cap. Like every plan, it follows the network’s Fair Usage Policy, which looks at your use over the last 3 days. If use is judged excessive, speed may be limited to about 1 Mbps for a while. The exact threshold isn’t published. Hotspot has its own total (days − 1 GB); beyond it, hotspot runs at 128 kbps.
Unlimited 5G has no data cap and no speed cap on your phone. Unlimited 10 Mbps has no data cap, with speed up to 10 Mbps. A Data Package gives 12, 21 or 30 GB at full speed, shared by phone and hotspot; after that, speed drops to 128 kbps. The Fair Usage Policy applies to every plan.
It isn’t roaming. It’s a Japanese local line on the KDDI (au) network, connected directly to KDDI’s network in Japan rather than routed through a roaming hub abroad. In Okinawa, the au network is run by Okinawa Cellular. The service is provided by ROKKODE Inc., a telecommunications carrier in Japan, under its Japanese-language MVNO terms, and sold by Vision Factory LLC.
You’ll connect on 5G where your phone, its bands and the local network support it. Everywhere else, you’ll connect on KDDI’s 4G LTE. Speed and coverage vary with location, time of day and congestion.
Your phone must support eSIM, be carrier-unlocked, support LTE Band 18 or Band 26 (Band 1 alone isn’t enough), and be allowed for use in Japan. The eSIM is made for smartphones and tablets; routers and other devices aren’t guaranteed. Phones with the same name can differ by region, so check your exact model number.
Yes. Install it at home over Wi-Fi. Your days only start when the eSIM first connects to the network in Japan. Please start using it by the start-by date we send with your eSIM; if you haven’t connected by then, your days start on that date.
Day 1 is the day your eSIM first connects in Japan. Days change at 00:00 Japan time (UTC+9), not 24 hours after you connect: if you first connect at 22:00, day 2 starts two hours later. Your plan ends at 23:59 Japan time on the last day.
Yes, on every plan. Unlimited 5G and Unlimited 10 Mbps include a hotspot total of days − 1 GB (2 GB on 3 days, up to 30 GB on 31 days); beyond it, hotspot runs at 128 kbps. A Data Package shares one total between phone and hotspot. Some Android phones need one extra APN setting for hotspot, and our setup guide shows how.
No. This is a data-only eSIM, so there’s no phone number, calls, SMS or emergency calls. Keep your home SIM for calls and texts, and use WhatsApp, iMessage or FaceTime over data.
No. The eSIM installs once, on one phone. If you delete it, it can’t be reinstalled, so keep it in your settings until your trip is over, even if something goes wrong.
Check that the eSIM line is on and selected for mobile data. On Android, if the APN isn’t set automatically, choose “5G NET” (not “5G NET for DATA”) or enter it as shown in our setup guide. On iPhone, go to Settings › General › VPN & Device Management and remove any profile left by another carrier, but not the eSIM itself. If it still won’t connect, contact us without deleting the eSIM.
Plans can’t be topped up or extended, so please choose enough days. Until you show your QR code or activation code on My Page, you can cancel for a full refund, even after our email has arrived. After that, refunds aren’t available. If the eSIM then won’t work in Japan, contact us and we’ll check and send a replacement eSIM. Replacements don’t cover phones that don’t meet the requirements, connection settings such as the APN that weren’t applied, or a deleted eSIM.
