The group of the first three digits of a mobile telephone number ( prefix) identifies the mobile network operator that assigned the number, but since 2002, mobile number portability is possible and thus any number can end up being managed by any carrier. It is still possible, but rare, to find nine-digit numbers, which were the first to be assigned. Mobile telephone numbers start with the digit 3 and are generally ten digits long. Prefixes are assigned on a geographical basis, starting from the north of the country for example: Rome has prefix "06", Milan has "02", Naples has "081", and Turin has "011". They are composed of a variable length prefix followed by a variable length subscriber number. Landline numbers start with the digit 0 and are 6 to 11 digits long, although they are rarely shorter than 9. The minimum length of telephone numbers is three digits and the maximum is twelve.
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Commonly used formatting or punctuation characters include the space character, the dot, full stop, and the hyphen.
Various grouping schemes are commonly used and a telephone number is likely to be written or pronounced differently by different people. The regulations for Italian telephone numbers prescribe no fixed rules for grouping the digits for printing or display. For calling foreign destinations from Italy, the international call prefix is 00, as is standard in most European countries.
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The country code for calling Italy from abroad is 39. (See Historical number formats below for an example.) Since 1998, the leading 0 of landline numbers has to be included also when calling in from abroad, in contrast with the practice in many other countries. The dialing procedures for callers mandate that the full telephone number is always dialed, including the area code, which is called prefix ( prefisso in Italian). Other initial digits denote other services, such as toll-free numbers. Four types of emergency services use three-digit telephone numbers in the group 11X, including 112 for the Carabinieri. Geographic landline numbers start with the digit 0, while mobile telephone numbers start with 3. The plan is organized by types of services, indicated by the first digit. In addition, other short codes are used for special services.
Telephone numbers are defined by an open telephone numbering plan that assigns subscriber telephone numbers of six to eleven digits. Telephone numbers in Italy are managed by the Autorità per le Garanzie nelle Comunicazioni (AGCOM), a national regulatory authority for the communication industry located in Rome. Map of Italy colored according to the landlines area codesĪutorità per le Garanzie nelle Comunicazioni
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