Public transport in Lisbon consists of bus, metro, tram and elevators. The best way to get around the city is to get the Viva viagem card at any of the metro stations. For only 6 euros a day you can travel around the city 24 hours a day using all public transport including the famous elevators of Santa Justa, da Bica, da Glória and da Lavra, as well as the famous trams 28 (Bairro Alto, Baixa and Graça) and 15 (Belém).
We walk out of the airport following the signs to the metro and at the metro entrance there are vending machines for the VIVA VIAGEM card (0,50€). I charged it with the “24 hours” subscription (6,00€). With this card you can take the metro, bus, tram and lifts (including the Santa justa lift, but to go up to the viewpoint you must show the card and pay €1.50).