Lisbon's public transit card is the Viva Viagem card.
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Lisbon uses the Viva Viagem card. The reloadable Viva Viagem card covers metro, trams (including the famous Tram 28), buses, and funiculars.
You can buy it at metro station machines or kiosks.
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.