Prepaid phone card. I usually use the one from AT&T (and it doesn't have to say that it's for international use) that I get at Target, which usually has them on sale once a month. You can get a $30 card for $15-20.
Then go here:
http://www.consumer.att.com/prepaidcard/fy/htw.html
http://www.usa.att.com/traveler/index.jsp
http://www.usa.att.com/traveler/acc...Index_Page.x=19&&lid=Go_Button_Index_Page.y=7
Detailed Dialing Instructions for Italy
Your access number for calling from Italy:
800-172-444
Tips for making calls in Italy
* Pay phones may require coin or card deposit.
* Includes Vatican City
Just follow these easy steps when placing a call from Italy:
If you are paying with an AT&T PREPAID PHONE CARD (not a billed calling card):
1. Dial the AT&T access number provided above.
2. An English-language voice prompt will ask you for the telephone number you are calling.
* Dial the toll-free number on the back of your AT&T PrePaid Phone Card.
* When prompted, dial the AT&T PrePaid Phone Card PIN or Account Number.
3. For calls to the U.S., Canada or the Caribbean, press 1 and follow the prompts.
* Dial the U.S. area code and 7-digit number you are calling. For calls to other countries, press 2 and follow the prompts.
* Dial the country code, city code, and local number you are calling;
Note: drop any leading zeros from country or city codes: e.g., if the code is 012, only enter 12.
4. To place another call, do not hang up, press # and follow the prompts.
VERY easy! I've used AT&T phone cards several times when traveling overseas.