To call anywhere in the European Union (France, Italy, Germany, etc) from United Kingdom,
dial: 00+country code
00- 39 - Area Code - Land Phone Number
00 - 39 - 10 Digit Mobile Number
00 - Exit code for United Kingdom, and is needed for making any international call from United Kingdom.
39 - ISD Code or Country Code of Italy.
Area code - There are 234 area codes in Italy.