Telephone numbers in Italy
Numbering plan 
Telephone numbers in Italy changed to a closed telephone numbering plan in 1998. The plan which had originally been advertised in early 1998 was to merge the trunk code '0' into subscribers' landline numbers effective June 19, 1998, and then to replace that leading '0' with a '4' starting from December 29, 2000. As a result of this change, all landline numbers would begin with a '4', and mobile phone numbers with a '3'. Other initial digits had been reserved for different special purposes. It was later decided that landline numbers should still begin with a '0', unlike in the closed numbering plans of many other countries. E.g. a land line number in Rome:
06 xxxxxxxx (within Rome - after 1999) 06 xxxxxxxx (within Italy) +39 06 xxxxxxxx (outside Italy - after 1998)
Calls to mobile phone numbers within Italy were also affected, deleting the previously used trunk code '0'. International calls to Italian mobile phone numbers were not affected. E.g. for former Omnitel, now Vodafone Italy:
0347 xxxxxxx (within Italy - before 1999) 347 xxxxxxx (within Italy - after 1999) +39 347 xxxxxxx (outside Italy - both before and after 1999)
Landline numbers (area code+exchange+number) are generally 9 or 10 digits long, although they can be as little as 6 or as many as 11 digits. Mobile numbers are always 10 digits long, with the only exception of very old TIM numbers, which are 9 digits long (though those are now extremely rare).
Mobile telephones 
Mobile phone number in Italy: without a zero, started with a 3. Mobile phone numbers are generally 10 digits long (3 digits for the prefix + 7 digits for the subscriber number). However, some rare 9 digits long (3+6) phone numbers are still in use, and so are new numbers with 11 digits (3+8).
3xx xxxxxxx (within Italy and San Marino) +39 3xx xxxxxxx (from the rest of the world)
San Marino 
Until 1996, San Marino was part of the Italian numbering plan, using the Italian area code 0549 but in that year it adopted its own country code 378. However, instead of using international dialing codes, dialing arrangements between San Marino and Italy continued as before. In 1998, San Marino incorporated the 0549 area code into its subscribers' numbers, following the Italian format:
0549 xxxxxx (San Marino from Italy) + 378 0549 xxxxxx (San Marino from rest of the world) + 39 0549 xxxxxx (San Marino via Italy)
Vatican City 
Similarly, Vatican City is assigned country code 379. However, Vatican City is still reached via the Italian numbering plan. Telephone numbers in the Vatican City are similar to telephone numbers in Rome, with "698" following the "06" for Rome.
06 698xxxxx (Vatican City from Italy) +39 06 698xxxxx (Vatican City from rest of the world)
List of codes 
00- international access code (+) 00800- toll free (international) 0878- mass calls phone number (polls, television programs, etc.), max. 0.66€+0.23€/min
1- Service and emergency numbers 112 General emergency, gendarmerie (Carabinieri) 113 General emergency, police (Polizia di Stato) 115 Fire and rescue service (Vigili del Fuoco) 117 Italian Customs/Financial/Border Police Guardia di Finanza 118 Ambulance and first aid service(Italian Red Cross included) 12xx Premium rate services 144- Premium rate services, max. 0.07€+1.31€/min 15xx Other emergency and information services 1515 Fire, forest and environemental emergency (Corpo Forestale dello Stato) 1518 Road information service (CCISS) 1530 Search and rescue on sea (Corps of the Port Captaincies – Coast Guard) 166- Premium rate services, max. 0.07€+1.31€/min 178- Premium rate services, max. 0.15€+0.35€/min 18- Customer care services 19- Customer care services 199- Premium rate services, max. 0.12€+0.26€/min
2- Reserved for future purposes
3- mobile phones 313- Rete Ferroviaria Italiana (GSMR and internal service number, personal ones accessible even from public network) 32x- Wind mobile phones customers 33x- TIM mobile phones customers 34x- Vodafone Italy mobile phones customers 35x- future full-MVNO mobile phones customers 36x- TIM mobile phones customers 37x- various ESP/MVNO mobile phones customers 38x- Wind mobile phones customers 39x- H3G Italy mobile phones customers 4- internal phone net service numbers 5- Voip numbers (implemented and accessible only by few operators) 6- reserved for future purposes 7xx- internet service numbers 70x- dial-up internet access numbers 8- special rate numbers 80x- toll free number (within Italy) 84x- shared rate (information services), max. 0.10€+local rate/min 89x- Premium rate services (information and adult services) 892- Premium rate services, max. 0.30€+1.50€/min 9- reserved for future purposes
It is to be noted that this numbering plan doesn't strictly follow the boundaries of the provinces and city areas in order to solve in a simple way some technical constraints. So, for example, the geographical province of Avellino has two main prefixes (0825 and 0827) but also some common land with other prefixes like 0824 for San Martino Valle Caudina and 081 as for Baiano.
- Un elenco (parziale) delle tariffe da telefono fisso (in Italian)
- ITU allocations list
- The telephone area codes in Italy (PagineBianche)
- Find an Area Code (PagineBianche)
- whole in-force Numbering Plan