Italy is country code +39.
Within Italy, all numbers are 10 digits. Landline numbers begin with 0, and mobile numbers begin with 3. Landline numbers in Rome begin with 06.
To call from outside Italy, just prefix the Italian number with country code +39. Unlike most countries, you do not drop the trunk prefix 0. For example, a number in Rome beginning with 06 becomes +39 06.
(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.)
There is no telephone area code 660 in Italy. Area code 06 (or +39 06 in international format) is Rome. Geographic area codes in Italy begin with 0. Unlike most countries, you do not drop the leading 0 from the domestic area code in international format.
The telephone country code for Italy is +39. The area code for Perugia is 075, or +39 075 in international format. Note: unlike most countries, you DO NOT drop the trunk prefix 0 from the Italian domestic area code when putting the number in international format.
The telephone country code for Italy is +39. The area code for Como is 031, or +39 031 in international format. Note: unlike most countries, you DO NOT drop the trunk prefix 0 from the Italian domestic area code when putting the number in international format.
The telephone country code for Italy is +39. The area code for Ancona is 071, or +39 071 in international format. Note: unlike most countries, you DO NOT drop the trunk prefix 0 from the Italian domestic area code when putting the number in international format.
The telephone country code for Italy is +39. The area code for Cagliari is 070, or +39 070 in international format. Note: unlike most countries, you DO NOT drop the trunk prefix 0 from the Italian domestic area code when putting the number in international format.
The telephone country code for Italy is +39. The area code for Savona is 019, or +39 019 in international format. Note: unlike most countries, you DO NOT drop the trunk prefix 0 from the Italian domestic area code when putting the number in international format.
The telephone country code for Italy is +39. The area code for Taranto is 099, or +39 099 in international format. Note: unlike most countries, you DO NOT drop the trunk prefix 0 from the Italian domestic area code when putting the number in international format.
The telephone country code for Italy is +39. The area code for Biella is 015, or +39 015 in international format. Note: unlike most countries, you DO NOT drop the trunk prefix 0 from the Italian domestic area code when putting the number in international format.
The telephone country code for Italy is +39. The area code for Messina is 090, or +39 090 in international format. Note: unlike most countries, you DO NOT drop the trunk prefix 0 from the Italian domestic area code when putting the number in international format.
The telephone country code for Italy is +39. The area code for Monza is 039, or +39 039 in international format. Note: unlike most countries, you DO NOT drop the trunk prefix 0 from the Italian domestic area code when putting the number in international format.
The telephone country code for Italy is +39. The area code for Modena is 059, or +39 059 in international format. Note: unlike most countries, you DO NOT drop the trunk prefix 0 from the Italian domestic area code when putting the number in international format.
The telephone country code for Italy is +39. The area code for Padova (Padua) is 049, or +39 049 in international format. Note: unlike most countries, you DO NOT drop the trunk prefix 0 from the Italian domestic area code when putting the number in international format.