Best eSIM for Japan: prices, networks and how to choose
Updated 30 October 2026
For most visitors, the easiest way to get online in Japan is a data-only eSIM: install it at home, switch it on when you land at Narita, Haneda or Kansai, and skip the airport counters. Providers differ in four ways that matter: the price for the data you'll actually use, how long the plan lasts, which network you get, and whether you need a Japanese phone number.
Prices side by side
| Data | globeSIM | Airalo | Saily | Nomad |
|---|---|---|---|---|
| 1 GB | $3.40✓ Cheapest30 days | $4.003 days | $3.997 days | $4.007 days |
| 3 GB | $6.90✓ Cheapest30 days | $7.503 days | $7.9930 days | $7.0030 days |
| 5 GB | $9.90✓ Cheapest30 days | $10.007 days | $10.9930 days | $10.0030 days |
Each provider's cheapest plan of that size that works here, including their regional plans; no unlimited, daily-limit, subscription or new-customer-only offers. Prices in US dollars as listed on 30 October 2026 (via esimdb.com and the providers' sites). Prices change, so check before you buy.
Look at how long each plan lasts, not just the price: a cheap plan that ends after 3 days can cost more over a week than one that runs for 30 days.
Above 10 GB, compare carefully. Data costs more in Japan than in most countries, and prices between providers are close at that size.
Which network you'll be on
Japan has three big networks. NTT Docomo usually reaches furthest into the countryside: the Japanese Alps, Tohoku and Hokkaido's hiking trails. SoftBank and KDDI (au) are strong in cities and along the train lines.
Our Japan eSIM can use both Docomo and SoftBank, and your phone picks the stronger signal. Other providers list their networks on their Japan pages; check them if you're heading into the mountains.
Fixed data or unlimited?
Most travellers use 0.3 to 1 GB a day, so a 5 GB plan covers a typical week of maps, trains, messaging and social media, and 10 GB covers two.
Unlimited plans, sold by the day, suit people who stream video, make long video calls or share data with a laptop. Read the fair-use terms: most slow down after a daily amount.
eSIM, pocket Wi-Fi or a Japanese SIM?
| Option | Good for | Watch out for |
|---|---|---|
| Travel eSIM | Online the moment you land; nothing to pick up or return | Data only; your phone must support eSIM |
| Pocket Wi-Fi | Groups sharing one connection, older phones | Pick-up and return, one more device to charge, priced by the day |
| Japanese SIM with a number | Long stays, services that confirm by SMS | Passport checks, often a store visit |
Before you fly
- Check your phone supports eSIM: dial *#06# and look for an EID number.
- Install the eSIM at home on Wi-Fi. The plan starts only when you first connect in Japan.
- Download offline maps and Google Translate's Japanese pack.
- When you land, switch the eSIM on, turn on data roaming for it, and choose it for mobile data.
- Keep your own SIM on for bank codes and calls.
Questions
Do I need a Japanese phone number?
Rarely. Calls work over WhatsApp, LINE or FaceTime. A few restaurant bookings and rentals confirm by SMS; your hotel can usually help with those.
Does the eSIM work on the shinkansen?
Yes, along the lines. Expect short drops in long mountain tunnels.
Do I need a VPN in Japan?
No. Japan doesn't block apps or websites, so Google, WhatsApp and Instagram work as at home.
Can I share data with a laptop?
Yes, hotspot works on every plan. A laptop uses much more data than a phone, so take a bigger plan.