Best eSIM for Japan in 2026: 6 providers compared

How we ranked these eSIMs

Each eSIM is scored on six criteria, with the same weights for all. Price per GB and network coverage weigh the most: Japanese 4G and 5G reach almost the whole population, but gaps remain in the mountains, on the small islands and in parts of rural Tohoku or Kyushu. That is where the provider's network choice matters.

• Price per GB25 %

  Real cost per gigabyte on each provider's cheapest plan, excluding one-off promotions.

• Network coverage25 %

  Signal in Tokyo and Osaka, but also in the Japanese Alps, Hokkaido, Okinawa and on the Shinkansen.

• Reliability15 %

  Connection stability, observed speeds and the seriousness of the company behind the eSIM.

• Support15 %

  Channels, hours, human or bot, response time.

• Activation and app10 %

  How easy the install is, how clear the app is, usage tracking.

• Plan flexibility10 %

  Choice of data amounts and durations, top-ups, unlimited, multi-country.

On these criteria, voilà eSIM comes out on top with the best price per GB (€0.63/GB), the NTT Docomo network, the widest in the country, and the most accessible support in the comparison.

Scores are the opinion of the eSIMrat editorial team, based on the criteria above, not customer reviews. eSIMrat earns a commission on links to its partners, which does not affect the ranking.

The Japan eSIM ranking

The 6 eSIMs compared, from highest to lowest score. The price per GB shown is that of each provider's cheapest plan per gigabyte, often a large 30-day plan: on a small plan, the gap between providers narrows.

Prices checked on September 4, 2026 on the providers' sites. eSIMrat partners' prices come from the comparator and refresh on every build.

Each Japan eSIM in detail

1. 

   1. voilà eSIM

   8.9/10
   €0.63/GBNTT DocomoData plans from 1 to 50 GB

   ✓Best price per GB, NTT Docomo network, human support

   voilà eSIM, a French brand, runs on NTT Docomo, Japan's widest network: 5G in Tokyo, Osaka and Kyoto, 4G everywhere else, down to rural areas, the mountains and the Shinkansen.

   Pricing goes down to €0.63/GB, the lowest in this comparison, which gives it the best value for money in the ranking. Plans run from 1 to 50 GB over 7, 15 or 30 days, with no commitment, and tethering is included.

   The eSIM is easy to install from an app that is simple to use, before you leave. Customer support is human, 24/7, which no other provider in this ranking offers. A promo code is listed on the voilà eSIM promo codes page.

   Pros

   • ✓Lowest price per GB in the comparison
   • ✓NTT Docomo, the widest network in Japan
   • ✓Human support 24/7, simple app, tethering included

   Cons

   • ✗No unlimited plan
   • ✗No multi-country Asia plan
   See the offer
2. 

   2. Esimzon

   7.8/10
   €0.88/GBNTT DocomoData plans from 3 to 20 GB

   ✓Almost voilà eSIM's price, on the same network

   Esimzon is a prepaid reseller that competes on price. In Japan its plans run on NTT Docomo, the same network as voilà eSIM, for a rate that is only slightly higher: €0.88/GB.

   The catalogue is shorter, from 3 to 20 GB, and prices are shown in dollars on its site, with the euro following the daily rate. Activation is by QR code, support answers by email or chat in English, and the app is less polished than those of the established brands.

   Pros

   • ✓Price per GB close to the best in the ranking
   • ✓NTT Docomo network

   Cons

   • ✗No plan above 20 GB
   • ✗English support by email or chat
   • ✗Prices shown in dollars
   See the offer
3. 

   3. Ubigi

   7.7/10
   €1.10/GBKDDI and NTT DocomoOne-off, monthly and unlimited plans

   ✓Dual network, top-up in the app

   Ubigi is the eSIM of Transatel, an NTT group subsidiary. In Japan it switches between KDDI and NTT Docomo, which limits dead zones where a single-network provider drops out. 5G is included.

   The rate, €1.10/GB, sits in the upper half of the ranking. In return, the app lets you top up without wifi, prices are in euros, and the catalogue runs from one-off plans to monthly subscriptions and unlimited. Support answers by ticket, in English and French.

   Pros

   • ✓Dual network KDDI and NTT Docomo
   • ✓Top-up in the app, prices in euros
   • ✓Monthly and unlimited plans

   Cons

   • ✗Price per GB about twice the best in the ranking
   • ✗Ticket support, no chat
   See the offer
4. 

   4. Airalo

   7.6/10
   €1.10/GBSoftBank and a second networkData, regional and unlimited plans

   ✓Best-known brand, global catalogue

   Airalo is the pioneer of travel eSIMs, available in more than 200 countries. In Japan the offer runs on SoftBank, excellent in cities, with a second network listed on the plan page. The price, €1.10/GB, stays above the best rates in the ranking.

   The app is complete, with built-in top-up, and the global catalogue is handy if you chain Japan with South Korea or Taiwan on the same trip. Support, in English and sometimes slow, remains its main weakness.

   Pros

   • ✓Available in 200+ countries, regional Asia plans
   • ✓Complete app with top-up
   • ✓Unlimited plan available

   Cons

   • ✗Price per GB above the best in the ranking
   • ✗English support, sometimes slow
   • ✗SoftBank less extensive than NTT Docomo outside cities
   See the offer
5. 

   5. Saily

   7.5/10
   €1.10/GBLocal networksData and unlimited plans

   ✓By Nord Security, built-in security

   Saily is Nord Security's eSIM, the company behind NordVPN. Pricing sits at €1.10/GB, in the upper half of the ranking, with an ad and tracker blocker and web protection built into the app.

   Saily does not announce the Japanese operator up front on its page: the eSIM connects to the available local networks. Plans are simple, in euros, with an unlimited option, and support is a 24/7 chat in English.

   Pros

   • ✓Built-in security (ad and tracker blocker)
   • ✓Simple app, prices in euros, unlimited available

   Cons

   • ✗Upper-half pricing
   • ✗Operator not announced before purchase
   • ✗Chat support, in English
   See the offer
6. 

   6. Yesim

   7.4/10
   €1.10/GBNTT Docomo, SoftBank or KDDIDaily, data and unlimited plans

   ✓Reusable eSIM, from 1-day plans to unlimited

   Yesim, a Swiss provider, lists partnerships with Japan's three big operators, NTT Docomo, SoftBank and KDDI, and switches automatically to the fastest network available, 5G included. The price, €1.10/GB, is in the upper half of the ranking.

   Its appeal lies elsewhere: the same eSIM is reused on your next trips, and the catalogue runs from daily plans to unlimited. Support is by chat.

   Pros

   • ✓Reusable eSIM, trip after trip
   • ✓Three Japanese networks, automatic switching
   • ✓From 1-day plans to unlimited

   Cons

   • ✗Upper-half price per GB
   • ✗Chat support only
   See the offer

Which Japan eSIM for your profile?

The eSIM we recommend for each kind of traveller.

• 
  Tight budgetvoilà eSIM€0.63/GB, the best rate in the comparison, on NTT Docomo.
• 
  Countryside and mountainsvoilà eSIMNTT Docomo, the widest network down to rural areas.
• 
  Human supportvoilà eSIMA human team that answers 24/7.
• 
  Dual networkUbigiKDDI and NTT Docomo, with top-up in the app.
• 
  Several Asian countriesAiraloRegional plans and a catalogue of 200+ countries.
• 
  SecuritySailyBuilt-in ad and tracker blocker.