Italy is country code +39. All numbers have ten digits after the country code.Important: Italy is an exception to the rule that you drop the leading '0' of the national number when calling from abroad. For example, Rome is 06 within Italy, or +39 06 (not +39 6) in international format. All landline numbers in Italy begin with +39 0. Mobile numbers begin with +39 3.(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)