12 GB eSIM for Japan - 4 Days
12 GB of 5G/4G data across Japan for 4 days, on KDDI's native network. Delivered as a QR code the moment you pay - install before you fly, switch it on when you land.
- Data
- 12 GB
- Validity
- 4 days
- Network
- KDDI 5G
- Hotspot
- Included
Powered by
KDDI
Plan
12 GB · 4 days
$9.12USD - one-time
$2.28 per day - no contract, no auto-renewal
- QR code emailed instantly
- No ID verification required
- Keep your home number active
Need a different length?
See all Japan eSIM plansEvery duration is its own plan and its own page. Same KDDI network, same instant QR delivery.
$9.12
You are viewing this plan$15.20
$20.90
$28.12
Unlimited instead
Unlimited - 4 days
$9.12
What's included
12 GB of full-speed data. About 3 GB a day across 4 days - enough for maps, messaging and social feeds.
Personal hotspot. Share the connection with a laptop, tablet or the people you travel with.
A Japanese IP address. Local apps, maps and streaming behave the way they do for residents.
Automatic setup. The APN configures itself - nothing to type in on arrival.
No ID checks. No passport upload, no registration form, no waiting for approval.
Not included
A Japanese phone number. This is a data-only plan.
Voice calls and SMS. WhatsApp, LINE, FaceTime and Zoom all work over data.
Top-ups. To extend, buy another plan - it installs alongside this one.
Coverage outside Japan. The plan works on Japanese networks only.
Fair use
The 12 GB allowance is shared across the whole 4 days. When it runs out the data stops - buy another plan to keep going.
Plan specification
Everything this eSIM does, in full. Nothing hidden behind a support ticket.
| Plan name | 12 GB eSIM for Japan - 4 Days |
|---|---|
| Plan type | Data only |
| Data allowance | 12 GB |
| Throttling | None |
| Validity | 4 days |
| Activation | On first use |
| Install before | 180 days from purchase |
| Billing | One-time, $9.12 |
| Operator | KDDI (au) - Japan |
|---|---|
| Technology | eSIM - 5G / 4G LTE |
| APN | au.5g.au-net.ne.jp |
| APN configuration | Automatic |
| Hotspot / tethering | Supported |
| Data roaming | Supported |
| ID verification (KYC) | Not required |
| Calls / SMS | Not included |
Plan ID AwABAxIAAABKUEstNGRheXMtMTJnYi1hbGw - Product Japan KDDI
Installing this eSIM takes about two minutes.
- 1
Buy and receive the QR
The QR code lands in your inbox seconds after checkout, together with the manual activation codes if you prefer to type them in.
- 2
Scan it at home on Wi-Fi
Settings, then Mobile Data, then Add eSIM, then scan. Install any time within 180 days of buying; the 4 days have not started yet.
- 3
Land in Japan, switch it on
Turn on the line and data roaming. The phone attaches to KDDI automatically and the 4 days begin at that first connection.
Coverage & speed
Native KDDI, not a roaming reseller.
This plan sits directly on KDDI's Japanese network. You get the same signal a local subscriber gets, from central Tokyo to Shinkansen tunnels and rural Hokkaido - with a Japanese IP address rather than a foreign one tunnelled home.
- of the population covered
- 99%of the population covered
- peak measured 5G speed
- 871 Mbpspeak measured 5G speed
- typical latency
- ~32 mstypical latency
Device compatibility
Your phone needs eSIM support and must be carrier-unlocked.
Apple
- iPhone XS / XR and later
- iPhone SE (2020) and later
- iPad Pro 11 inch and Air 3 and later
Android
- Samsung Galaxy S20 and later
- Google Pixel 3 and later
- Most 2022 and newer flagships
Questions about this plan
Is 12 GB enough for 4 days in Japan?
It works out to roughly 3 GB per day across the 4 days, which comfortably covers maps, messaging, transit apps and social feeds. Streaming video for hours or tethering a laptop all day will use 12 GB faster, so consider a larger bundle or an unlimited 4-day plan if that sounds like your trip.
When do the 4 days on the 12 GB eSIM start?
At first use. The 4-day clock starts the moment the eSIM first connects to a Japanese network, not when you pay and not when you install it. You can install the 12 GB eSIM at home over Wi-Fi days or weeks earlier without losing a single day.
How much does the 12 GB eSIM for 4 days cost?
$9.12 as a one-time payment, which is about $2.28 per day across the 4 days. There is no contract, no auto-renewal and no deposit, and hotspot tethering is included at no extra charge.
Does the 4-day 12 GB plan allow hotspot tethering?
Yes, tethering is enabled at no extra cost, so a laptop, tablet or a travel companion's phone can share the connection. Everything they use comes out of the same 12 GB, so keep an eye on it if you are sharing across the full 4 days.
I am travelling in a few months - can I buy the 4-day 12 GB eSIM now?
Yes. The QR code stays valid for 180 days from purchase, and the 4-day validity only starts when the 12 GB eSIM first connects to a network in Japan. Buying months ahead of your trip is fine.
Do I need to configure an APN for the 4-day 12 GB eSIM?
No. The 12 GB eSIM configures itself when it attaches to KDDI, so there is nothing to type in on arrival. If your device ever asks during the 4 days, the APN is au.5g.au-net.ne.jp.
Japan eSIM travel guides
Plan your trip with our latest guides on network coverage, data plans, and staying connected across Japan.
KDDI network coverage in Japan
How Japan's KDDI network performs for tourists, from major cities to rural regions.
Read guideUnlimited data in Japan, explained
What unlimited really means for travelers, from fair-use policies to real-world speeds.
Read guideWhy an eSIM is essential in 2026
Why an eSIM is the simplest way to get online the moment you land in Japan.
Read guide12 GB for your 4 days in Japan.
$9.12, one payment, QR code by email. Install tonight, connect the moment you land.