Does Firsty work everywhere in Japan?

Firsty connects to NTT Docomo, KDDI (au), and SoftBank, Japan's three largest networks covering 99.9% of the population. You'll have signal in major cities, on bullet trains, in mountain resorts, and on most Japanese islands.

How do I activate my eSIM when I land in Japan?

You don't need to wait. Set up Firsty before you leave, when you land at Haneda, Narita, Kansai, Chubu, or Fukuoka, your eSIM activates automatically as soon as your phone connects to a network.

What happens to my Prepaid GBs if I don't use them in Japan?

Nothing. They stay on your account. Firsty Prepaid GBs never expire. You can use the rest of your data on your next trip, anywhere in 185+ countries.

Is Firsty Free enough for a trip to Japan?

For light use: messaging, maps, Uber, email, yes. The free tier runs at basic speed and you earn data by watching short ads. For HD video, streaming, or hotspot, you'll want Prepaid or Unlimited.

Is Firsty cheaper than buying a SIM at the airport?

Almost always. Airport SIMs in Japan typically cost €30–50 for 7 days. Firsty Prepaid is €0.98/GB, so a 10 GB trip is under €15. Free tier is genuinely €0.

Can I make calls and send SMS with Firsty in Japan?

Firsty is a data eSIM: calls and texts work through WhatsApp, FaceTime, iMessage, or any internet-based app. International calling to 200+ countries is available through the Firsty app at transparent per-minute rates.

Does Firsty work on the Shinkansen?

Yes. Because Firsty connects to multiple Japanese carriers, you'll keep signal during high-speed train travel, including the network handoffs that drop single-carrier eSIMs.

What if I run out of data in Japan?

Open the Firsty app and top up instantly, buy more GBs or extend your Unlimited pass. Or watch an ad to extend your free tier.

What devices work with Firsty in Japan?

Any eSIM-compatible phone bought in the EU, US, UK, Canada, Australia, or Japan after 2018. iPhone XS or newer, recent Samsung Galaxy, Google Pixel, and most other modern Android phones.

eSIM for Japan: free data, GBs, or unlimited from €2/day

One eSIM for Japan. No roaming bill, no SIM swap, no commitment.

Firsty connects you to Japan's three biggest networks

Firsty connects you to NTT Docomo, KDDI (au), and SoftBank through a single eSIM that activates in under 60 seconds. Start free by watching ads, buy GBs that never expire, or go unlimited from €2/day. The same eSIM works in 184 other countries when your trip continues.

No contracts. No fair use traps. No €30 daily roaming charge from your home operator.

Choose Your Plan

Firsty Free

Watch ads - Zero costs

Available for users in North-America, Europe & APAC
Basic Speed
Email, Messaging Apps, and Uber
With Ads
Top-up for calling abroad with credits

Download app Learn More

Popular

Comfort+

starts at €N/A per day

All Features from Firsty Free
High Speed
Browsing, Navigation and Social Media
No Ads
Top-up for calling abroad with credits

Buy now Learn More

First Class

starts at €N/A per day

All Features from Comfort+
Extra High Speed
Video Streaming
Use Phone as Hot Spot
Top-up for calling abroad with credits

Buy now Learn More

Why Firsty is different in Japan

Same price as everywhere else Other eSIM apps charge more for Japan than for Spain or Portugal. Firsty doesn't. €0.98 per GB on Prepaid, €2/day on Unlimited the same as it would be if you were in Mexico, India, or Italy. One price, everywhere. Buy data that never expires Most travel eSIMs make you buy GBs that expire in 7 or 30 days use it or lose it. With Firsty Prepaid, the GBs you buy stay on your account forever. Bought 10 GB and only used 3 in Tokyo? The other 7 are still there for your next trip to Seoul, Bangkok, or anywhere else.

Japanese networks

185+

Countries, 1 eSIM

One eSIM, every country Visiting Japan as part of a longer trip? Your Firsty eSIM also works in South Korea, Taiwan, Thailand, Singapore, and 180+ other countries same eSIM, same app, no reinstall.

How it works

How Firsty works in Japan

Network coverage

Strongest local network

Firsty automatically connects to the strongest local network: Docomo, KDDI, or SoftBank, so you get signal in Tokyo subway tunnels, on the Shinkansen between Kyoto and Osaka, in Kyoto temples, and in rural Hokkaido. No manual switching, no APN setup.

Quick activation

Activation in 60 seconds

Download the Firsty app, sign up, tap "Activate." Your eSIM installs automatically: no QR code, no email to wait for. Set it up before you leave, and it activates the moment you land at Haneda, Narita, or Kansai.

No more worries

Stop worrying about data

Bought too much? It rolls over. Bought too little? Top up instantly in the app. Bought a day pass? Pause it if you spend a day at the hotel.

How much data do you need in Japan?

3 to 5 days

Casual sightseer

~3–5 GB Google Maps, restaurant translations, WhatsApp, photo uploads to iCloud. Firsty Free handles this if you're OK watching ads or Prepaid 5 GB for €9.50 if you want speed without thinking about it.

7 to 10 days

Active traveler

~10–15 GB Add YouTube videos on the train, hotspot for your laptop, video calls home. Prepaid 10 GB for €17, or Unlimited 7-day pass (€19.25 total) if you don't want to count.

10+ days

Heavy user / remote worker

Unlimited Streaming, hotspot, video meetings on Zoom. Firsty Unlimited drops to €2/day once you hit 20 days, or the Monthly subscription at €49 if you travel often.

Real benchmarks

Google Maps

1 hour of Google Maps navigation: ~30 MB

Social Media

Full day of casual social media + maps: ~1 GB

YouTube HD

1 hour of YouTube (1080p): ~1.5 GB

WhatsApp Call

1 hour of WhatsApp video call: ~500 MB

Music Streaming

1 hour of online music streaming: ~100 MB

Aww, We love you too!!

Brian da Silva - The only app I will use abroad for data!

This was super easy to set up, fast and worked everywhere! I used it in South Africa for 10 days.

Stijn Kra - Top eSIM app

This app gives you fast and easy access to the internet worldwide. Their customer support is also excellent. Definitely recommended!

ABoer_ - Great product

Super easy to use and good connection! Used the app in Africa.

FlashTaxiDEU - Best app while roaming

We tried this whilst travelling in Spain, and for minimal amount of money per day, you have unlimited internet. It’s easy and super helpful. Goodbye physical sims, waiting at airports.. we love it and recommend it

Ruben Lenten - Nice serivce

My eSIM worked nicely across many countries with top speed and I love Firsty's mission to make connectivity available for everyone! 👌

Ravsterocks - Super service.

I have used this app multiple times in the USA and have recommended it to others as well. I am so happy and impressed with it. I can’t recommend it enough to others.

AndrStore - The best

This is the best app ever! Thank you guys!