In Japan: Uber operates with limitations — use GO instead.
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Uber has limited availability in Japan. Uber mainly functions as a taxi-hailing interface in Tokyo rather than full rideshare, due to Japanese regulations — GO (formerly JapanTaxi) is the dominant local app.
GO is the recommended app to use in Japan.
Uber has exited or been restricted in several markets due to local regulations or competitive sales — for example, it sold its Southeast Asia business to Grab and its China business to Didi, and has faced regulatory bans in a handful of European countries.
Yes — download GO and set up payment before you land, since some apps require a local phone number or work poorly without a data connection right at the airport.