Argentina's universal transit card app. SUBE is required for buses, trains, and the Subte (subway) across Buenos Aires and 60+ cities nationwide. The app lets you top up your card digitally and check your balance. Android users with NFC can also use SUBE Digital to pay directly from their phone.
Argentine: The Buenos Aires Subte and many city bus lines now also accept contactless credit/debit cards and digital wallets. But you'll still need SUBE for suburban trains and buses outside the city center.
