Yes, Japan's telecommunications infrastructure is highly advanced. You can expect consistent 4G/5G signal coverage while traveling on the Shinkansen (bullet train) between major cities such as Tokyo and Kyoto. Furthermore, the extensive underground subway systems in urban centers like Tokyo and Osaka are largely equipped with mobile network repeaters, ensuring you maintain data connectivity even when commuting below ground. CoreESIM leverages the robust networks of carriers like NTT Docomo to provide this ubiquitous coverage.
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Will I have internet coverage on the <strong>Shinkansen</strong> and <strong>Tokyo Metro</strong>?
Updated April 22, 2026
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