Japan eSIM

eSIM Japan: FAQ

• 1Which eSIM for Japan, and will my phone work there?

  You need a Japan travel eSIM and an eSIM-capable, unlocked phone. Current iPhones and Samsung Galaxy and Google Pixel models usually work on Japan's 4G and 5G networks without problems. The MonoEsim eSIM uses a Japanese partner network: install it at home on Wi‑Fi and you are online on landing at Tokyo Narita, Tokyo Haneda or Osaka Kansai – for Google Maps in the rail maze, translation apps, reservations and digital tickets. Your own SIM stays in the phone for calls and bank texts, and you pay only the pack you chose.

• 2Which networks are there in Japan, and is there still 3G?

  Japan has four operators: NTT docomo, KDDI (brand au), SoftBank and Rakuten Mobile. 3G is gone: KDDI switched it off in 2022, SoftBank in 2024, and docomo closed its FOMA 3G network at the end of March 2026, so mobile data runs only on 4G and 5G. Coverage is very dense in Tokyo, Osaka, Kyoto and along the main rail lines, and 5G is widespread in cities; mountains, small islands and rural areas can be weaker.

• 3eSIM, pocket Wi‑Fi or Japanese SIM card: which is better?

  Rental pocket Wi‑Fi routers are popular in Japan: one device serves several phones, but you collect it at the airport, charge it daily, carry it everywhere and return it before you fly. Tourist prepaid SIMs are sold at airports and electronics stores, usually against your passport; in 2026 Japan also amended its law so that data-only SIMs require identity checks. The MonoEsim eSIM is installed before you fly and needs no extra device. The trade-off: it is data-only, with no Japanese number.

• 4How much data do I need for 1, 2 or 3 weeks in Japan?

  Japan trips use a lot of navigation, translation and restaurant search. As a guide: 5 GB for one week, 10 GB for two weeks, and 15–20 GB or an unlimited plan (where offered) for a three-week route from Tokyo via Kyoto and Osaka to Hiroshima. Add more for a hotspot or lots of video.

• 5Do I need data on arrival for Visit Japan Web?

  Visit Japan Web is the Japanese government's official online service for immigration and customs procedures. Fill it in before you fly and save the QR codes as screenshots, so you need no connection at the counter. Switching the eSIM on right after landing still helps you find the train into the city and contact your accommodation.

• 6Is there signal on the Shinkansen, in the subway and in the countryside?

  Subway stations in Tokyo and Osaka have signal, and usually the tunnels too. On the main Shinkansen lines the connection is mostly stable but can drop briefly in tunnels. Rural areas, national parks, mountains and small islands have more gaps, as with any SIM, so keep tickets, your accommodation address in Japanese and maps offline.

• 7When should I install and activate the Japan eSIM?

  Install it a day or two before you fly, at home on Wi‑Fi. Keep the line off during the flight and any layover, for example in Dubai, Doha, Helsinki or Istanbul; validity usually starts with the first connection in Japan. After landing, turn it on, select it for mobile data and enable data roaming for that line.

• 8Can I make calls and use LINE with the eSIM?

  The MonoEsim eSIM is data-only, without a Japanese number. LINE, WhatsApp, FaceTime and translation apps work over its data connection, including calls. Services that explicitly require a Japanese phone number will not accept it; on a dual-SIM phone your home number stays active for text-message codes.

• 9Which eSIM do I need for Japan?

  For Japan, MonoEsim offers data packs from 500 MB to 20 GB valid for up to 30 days plus unlimited plans. For a one-week trip with maps, messengers and social media, 3–5 GB is usually enough.

• 10How much does mobile data in Japan cost with an eSIM?

  An eSIM for Japan starts at $2.99 at MonoEsim. No contract and no hidden roaming fees — you only pay for the pack you choose.

• 11Does the eSIM work everywhere in Japan?

  Stay online in Tokyo, Kyoto and between islands without a local SIM. The eSIM uses local partner networks with 4G and, depending on the area, 5G. In remote areas coverage can be weaker, as with any SIM.

• 12Do I need roaming in Japan?

  No. The MonoEsim eSIM uses a local network. Turn data roaming on for the eSIM line only and off for your regular SIM — so your home carrier charges no roaming fees.