Taxis in Rome do not cruise, but if empty (look for an illuminated taxi sign on the roof) they will stop if you flag them down. Taxis wait at stands and can also be called by phone, in which case you're charged a bit more. The meter starts at EUR 2.33 from 7 AM to 10 PM, at EUR 3.36 on Sunday and holidays, and at EUR 4.91 after 10 PM. Each piece of baggage will add an extra EUR 2.03 to your fare. There are two different fare systems, one for outside the city and one for inside, shown on the LED meter display. Make sure your cab is charging you "tariffa uno" -- the cheaper one -- when you're in town. Use only licensed, metered yellow or white cabs, identified by a numbered shield on the side, an illuminated taxi sign on the roof, and a plaque next to the license plate reading servizio pubblico. Avoid unmarked, unauthorized, unmetered gypsy cabs (numerous at airports and train stations), whose renegade drivers actively solicit your trade and may demand astronomical fares. Some taxis accept some credit cards, but you must specify when calling that you will pay that way.
Taxi (06/5551, 06/3570, 06/4994, or 06/88177).