eSIM for Japan — Instant 4G/5G Data Plans

Japan's mobile network is served by three main operators: NTT Docomo, SoftBank, and au (KDDI). 4G LTE and 5G coverage is comprehensive across Tokyo, Osaka, Kyoto, and all major cities, with excellent connectivity along Shinkansen bullet train routes and main rail corridors. Japan's urban coverage is among the densest and fastest in the world. Rural areas including the Japanese Alps, Tohoku region, Hokkaido wilderness, and remote island destinations such as Yakushima and the Ryukyu Islands have coverage in town centres but signal weakens in mountain terrain and on hiking trails. MobiSIM connects through supported Japanese networks to deliver fast and reliable data across Japan's main cities, transit hubs, and tourist destinations.

Activate your MobiSIM eSIM before landing at Narita International Airport, Haneda Airport, or Kansai International Airport so you have data ready from the moment you clear customs. Japan's train network is world-class but complex, and having live data for Google Maps, Hyperdia, or Jorudan transit apps is essential for navigating Shinkansen connections, local trains, and metro systems in Tokyo and Osaka. Keep your home SIM active for calls while MobiSIM handles your data. Download offline maps and restaurant guides before travelling to rural onsen towns, Hokkaido national parks, and remote mountain areas, as signal weakens quickly outside main settlements. If you are hiking in the Japanese Alps around Kamikochi, trekking the Nakasendo trail, or visiting Yakushima's ancient cedar forests, save all trail maps, accommodation details, and transport timetables offline before setting out.