Taxis in Buenos Aires are cheap and plentiful. All are black with yellow tops. An unoccupied one will have a small, red "Libre" sign on the left-hand side of its windshield.
Local wisdom has it that the safest taxis to hail on the street are those with a light on the roof that says "radio taxi", which are part of licensed fleets and are in constant contact with dispatchers. If you phone for a taxi, you'll have to wait a few minutes, but you can be sure where it has come from and that it is safe.
Legally, all taxis are supposed to have working seatbelts, but this isn't always the case.
Meters start at 3.80 pesos and charge 38¢ per 200 meters (650 feet); you'll also end up paying for standing time spent at a light or in a traffic jam. From downtown it will cost you around 12 pesos to Recoleta, 8–10 pesos to San Telmo, 16–20 pesos to Palermo, and 25–30 pesos to Belgrano. Drivers don't expect tips; rounding up to the next peso is sufficient.
City Taxi. 11/4585-5544.
Del Plata (11/4505–1111. www.delplataradiotaxi.com.)
Pídalo (11/4956–1200. www.radiotaxipidalo.com.ar.)
Premium (11/4374–6666. www.taxipremium.com.)
Radio Taxi Ciudad (11/4923–7007. www.radiotaxiciudad.com.ar.)