Yes, Japan's robust infrastructure ensures excellent mobile connectivity. With Truly Roaming, you can expect a stable 4G/5G signal on the Shinkansen (bullet train) for productive travel between major cities like Tokyo and Fukuoka. Even within the extensive underground subway networks of Tokyo and Osaka, mobile signal is widely available, allowing you to stay connected for work updates, navigation, or entertainment during your commute.
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Will I have internet coverage on Japan's Shinkansen and subway systems?
Updated April 22, 2026
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