10, 20, 50 GB or unlimited? Answer three questions and get your estimate in 30 seconds — then the eSIM plan that genuinely matches the way you travel. No jargon, no gigabytes paid for nothing.
Three questions, a cautious estimate, a clear recommendation. Change your answers as often as you like: the result updates instantly.
pour 14 jours au Japon
The estimate is deliberately generous: far better to end the trip with data to spare than to run out between Kyoto and Osaka. Real usage varies with your apps and your settings.
Exact figures depend on video quality, the app and your data-saving settings. Here are some cautious rough figures to picture where your gigabytes go.
| Activity | Intensity | Rough figure |
|---|---|---|
| Messaging — WhatsApp, iMessage | Light | ~ a few MB a day |
| Google Maps — directions & metro | Light | ~ 5 to 10 MB per hour of navigation |
| Browsing, searches & translation | Light | ~ 60 MB per hour |
| Music streaming | Medium | ~ 50 to 150 MB per hour |
| Social media — Instagram, TikTok | Medium | ~ 150 MB to 1 GB per hour depending on the app |
| Video calls — FaceTime, WhatsApp | Heavy | ~ 300 to 500 MB per hour |
| Video streaming — YouTube, Netflix | Very heavy | ~ 1 to 3 GB per hour in HD |
| Tethering | Multiplier | every connected device uses data like an extra phone |
Indicative rough figures — lower as soon as you turn on data saver in your apps.
The rule to remember fits in one sentence: video is what weighs. Messages, directions and searches use very little, even all day long. An hour of TikTok or YouTube, on the other hand, can weigh as much as several days of Google Maps. If your thumb scrolls videos on the Tokyo metro the same way it does at home, size your plan accordingly — or switch to unlimited and stop thinking about it.
The hidden multiplier: tethering. A laptop connected to your phone uses data like an extra phone — sometimes more, with automatic updates. Good news: tethering is included with no limit on all our plans. Our tethering guide →
You'll probably recognise yourself in one of these four travellers. The rules of thumb are the ones on our product pages: 10 GB ≈ 7 days and 20 GB ≈ 14 days of everyday use.
A week on the ground, the itinerary already in your head, the phone as a compass more than a screen.
13,99 € valid for 30 days · ≈ 7 days of everyday use
Choose the 10 GB →Two connected weeks without watching the counter, from Tokyo to Osaka, stories included.
21,99 € valid for 30 days · ≈ 14 days of everyday use
Choose the 20 GB →Reels, vlogs and cloud backup on the fly: your trip gets published as fast as you live it.
34,99 € valid for 30 days · €0.70/GB
Choose the 50 GB →
Unlimited
Streaming, video calls, tethering: you're not watching anything at all.
from €29.99 15 days = €38.99 · ≈ €2.60/day
Choose unlimited →👥 Travelling as a group? −5% from 2 eSIMs and −10% from 3 or more, applied automatically at checkout. See our family & group page →
Between two temples, your phone works harder than it does at home. Four reasons to leave yourself some headroom.
Connections on the Tokyo metro, the Shinkansen platform in Kyoto, a hidden Osaka backstreet, the time of the last train: in Japan you navigate continuously, several hours a day. Each look-up is light, but multiplied across the whole trip the map becomes a real line item.
Menus, signs, konbini labels: photo translation quickly becomes a constant reflex — and every scan goes through the network. Add the "how does this work?" searches in front of a ramen vending machine, and the web is running all day without you noticing.
You no longer wait for the hotel Wi-Fi: stories, family group chats and automatic cloud backup upload over 4G/5G as the day goes on. A single full-quality video of the Shibuya crossing weighs more than all your Maps look-ups for the day.
Public Wi-Fi stays uneven from one place to the next — handy sometimes, never guaranteed. With an eSIM on the NTT docomo network (~99% data coverage), you stop thinking about it, from Hokkaidō to Okinawa and even on the Shinkansen. See network coverage →
QR code by email 2 minutes after purchase, automatic activation in Japan, and 180 days to activate your eSIM — order today, stress-free.
eSIM Japon data10 · 20 · 50 GB — valid for 30 days · ≈ €0.70/GB on the 50 GBfrom €13.99
Zero maths
eSIM Japon illimitée10 → 30 days · tethering includedfrom €29.99
Long stay, working holiday or studies? Take a look at the 50 GB/month subscription — €34.99/month, no commitment and cancellable in one click. Our working holiday Japan and student in Japan guides cover both cases. And before you order, check that your phone is eSIM compatible.
For everyday use (Google Maps, messages, social media in moderation), work from the 10 GB ≈ 7 days rule of thumb. For two weeks, the 20 GB is the right size, and the 50 GB if you post videos every day. If you'd rather not watch anything at all, the unlimited eSIM → runs from 10 to 30 days, from €29.99.
No panic: top-ups are available on the site in a few clicks, with no eSIM to reinstall. If your estimate is already brushing the limit of a plan, take the next size up or go straight to unlimited: it often works out cheaper than topping up mid-trip.
Yes: each device connected to your phone (laptop, tablet, another phone) uses data like an extra phone. Be generous in your estimate, or go for unlimited. Tethering is included with no limit on all our plans. How to turn it on →
Yes: genuinely unlimited with no speed throttling, on the NTT docomo 4G/5G network, with tethering included. It comes in 10, 15, 20, 25 or 30 days, from €29.99 to €65.99. It's the choice for anyone who never wants to count gigabytes. See the durations →
Straight from your phone's settings: iOS and Android both show usage for each line, including your eSIM. Remember to reset the counter on activation day so it tracks your trip. Our step-by-step guide → shows you where to look, screen by screen.
NTT docomo 4G/5G network, QR code by email in 2 minutes, free guide + Google Maps map, and support 7 days a week — pick your plan, we'll handle the rest.
Choose my plan →Satisfaction guaranteed · −5% from 2 eSIMs, −10% from 3