Athens's public transit card is the ATH.ENA Ticket card.
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Athens uses the ATH.ENA Ticket card. A reloadable ATH.ENA card covers metro, bus, tram, and trolley — a 90-minute ticket lets you transfer freely.
You can buy it at metro station machines.
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.