Should you want to call home when in Italy you have several choices.
1) Use a public telephone. This is likely to be very expensive and is therefore not recommended.
2) Phone from one of the many Centri Telefoni or call centres located throughout most cities. These tend to be equipped with banks of phones and (occasionally) staff. You normally speak first and pay later, however some phone booths require a prepayment.
3) Buy an international call card. These are sold in most bars and newsagents. e.g. Edicard, allows you 300 minutes calling time for just €5,00. You can use the card at public phone booths or fixed land lines. This is the most cost effective option.