Japan
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Japan has one of the fastest and most reliable mobile networks in the world. The three major carriers — NTT Docomo, au by KDDI, and SoftBank — provide near-perfect 4G LTE coverage, including on bullet trains (Shinkansen) and in subway stations. 5G coverage is expanding rapidly in Tokyo, Osaka, Nagoya, and other major cities.
For travelers, Japan's connectivity is outstanding. Coverage extends seamlessly across all tourist destinations — Tokyo's districts, Kyoto's temples, Osaka's food streets, Hiroshima, Mount Fuji area, and even rural onsen towns. Japan's trains are famous for uninterrupted mobile connectivity, making real-time navigation incredibly reliable.
Average 4G speeds in Japan range from 40–120 Mbps, with 5G reaching 500+ Mbps in coverage areas. These speeds support everything from Google Maps navigation to video calls and live streaming.
Mobile Networks
Near-perfect 4G LTE coverage including trains and subways. Growing 5G in major cities.
Japan's train system is complex — Google Maps with real-time data is essential. Install your eSIM before arrival so navigation works from the moment you land at Narita or Haneda.
Japan's subway systems (Tokyo Metro, Osaka Metro) have full cellular coverage inside tunnels — unlike many other countries.
IC card apps (Suica/PASMO) on your phone require data to top up. Keep your eSIM active when using public transport.
Japanese addresses are notoriously difficult to navigate by text alone. Mobile maps with GPS are essentially required — your eSIM makes this seamless.
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