Yes, you can use your Pasmo card in Osaka and throughout the rest of Japan. Since the major IC card systems (Suica, Pasmo, Icoca, etc.) became "interoperable" in 2013, a card purchased in Tokyo works perfectly on the subways, buses, and private railways in Osaka, Kyoto, and beyond. You can even use your Pasmo to pay at convenience stores and vending machines in the Kansai region. The only major limitation is that you cannot use it for travel between regions (e.g., you can't "tap in" at Tokyo Station and "tap out" at Osaka Station on the Shinkansen). For the bullet train, you still need a separate ticket or a digital link via the SmartEX app. Additionally, if your Pasmo runs out of funds while you are in Osaka, you can top it up at any ticket machine in an Osaka station, though you can usually only get a refund for the remaining balance or the deposit at a station in the Tokyo area where the card was originally issued.
Yes, you can use a Pasmo card in Osaka, but with some limitations.
Pasmo can still be used for shopping at convenience stores, vending machines, and some shops in Osaka, even if JR trains don’t accept it.
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