Buenos Aires's public transit card is the SUBE card.
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Buenos Aires uses the SUBE card. The SUBE card covers the subte (subway), buses (colectivos), and trains across the city — essential and very cheap.
You can buy it at kiosks and subte (subway) stations.
Usually yes — it's typically faster than buying paper tickets and often cheaper per ride, even for just a couple of days.
In some cities you can tap a contactless card or phone directly, though it's worth checking current signage or the transit authority's site, since not every system supports it yet.