Taxis in Milano are white and don’t take on people on the street. It is possible to book one on the phone and online or going directly to one of the several taxi stands.
To book a taxi please use the Milano In Taxi service of the Comune di Milano:
Or else, call the radiotaxi companies:
Radio Taxi Freccia
The cost of the service varies whether it is a daytime or night service or a holiday.
Taximeters are also for collective use. Please ask for it at the beginning of the journey, for a minimum of three people leaving from the same location and reaching the same destination along the same route. Info here.
There are fix fares from and to the airports. Info here.