To call Sardinia from abroad, dial your international access number, Italy's country code (39) and then the local number (including the area code with the leading 0).
To call abroad from Sardinia, dial 00 to get out of Italy and then the relevant country and area codes, followed by the telephone number.
Mobile phone numbers begin with a three-figure prefix, typically 330, 331 etc.
Sardinian area codes all begin with 0 and consist of up to four digits. Always dial the area code, even when calling locally. Toll-free (free-phone) numbers, known as numeri verdi, usually start with 800.
As of June 2017, roaming charges no longer apply in the EU. Australian mobiles must be set up for international roaming.
US cell phones that operate on the 900 and 1800 MHz frequencies work in Sardinia.
SIM cards are readily available at phone and electronic stores in Sardinia.