Each international phone number starts with a country code, a numeric prefix assigned by the International Telecommunication Union (ITU). The code +39 exclusively designates Italy. When an incoming call displays this prefix on your screen, the line has been registered with an operator linked to the Italian numbering plan, whether it is a landline in Rome or a mobile in Palermo.
Why the zero after +39 changes everything for an Italian number
Most countries require the initial zero of the area code to be dropped when dialing a number from abroad. Italy is an exception. The zero is an integral part of the number and must be retained, even after the +39.
A call to a Roman landline is thus composed as follows: +39 06 followed by the subscriber number. If you receive a call displaying +39 06, it originates from the Rome area. +39 02 corresponds to Milan, +39 055 to Florence. The zero following +39 indicates a geographic landline.
Italian mobile numbers, on the other hand, start with 3 after the +39. A call displayed as +39 3xx indicates a mobile phone. This distinction allows you to know, even before answering, whether you are dealing with a landline (office, home) or a mobile.
To learn more about the phone code +39 and its country with Voyagoo, the complete structure of the Italian numbering plan is detailed along with the main regional ranges.
Italian area codes: decoding the first digits after +39 0
The length of an Italian landline number is not standardized. It varies according to the size of the city associated with the code. Large metropolitan areas have short prefixes (two digits), which leaves more room for the subscriber number. Medium and small cities use three or four-digit prefixes.
- 02 (Milan) and 06 (Rome): two-digit prefixes reserved for the two largest subscriber pools in the country
- 010 (Genoa), 011 (Turin), 041 (Venice), 081 (Naples): three-digit prefixes for regional capitals
- 0871 (Chieti), 0984 (Cosenza): four-digit prefixes for areas with lower telephone density
When you receive a call in +39 0, the following two to four digits inform you about the geographical location of the line. A number displayed as +39 081 comes from the Naples region. This quick reading helps to determine whether the call corresponds to an expected contact or not.
Call +39 starting with 3: identifying an Italian mobile and its sensitive ranges
Italian mobile prefixes all start with 3 after the +39. The most common series are 33x, 34x, 36x, and 38x, assigned to the main operators (TIM, Vodafone, WindTre). Each range of numbers has historically been linked to a specific operator, even though portability today blurs this correspondence.
The range +39 37x deserves special attention. A circular from AGCOM dated March 15, 2024 (n° 4/2024) imposes enhanced traceability for these numbers, after it was found that this series was massively used by unauthorized call centers targeting European residents.
Italian operators must now verify the identity of holders of 37x lines and block in advance those that do not have a valid declaration. A call received from an unidentified +39 37x can therefore be treated with more caution than a call from a +39 33x corresponding to a well-established public operator.
AGCOM anti-fraud filtering: what happens before your phone rings
Since late 2025, the Italian regulator has implemented a large-scale filtering system on outgoing calls from the Italian network. Approximately 49.3 million fraudulent calls were blocked in eleven days starting from November 19, 2025, according to figures provided by AGCOM and reported by the Italian press.
This mechanism acts upstream: illicit calls are intercepted before leaving the network, which means that some of the scam attempts in +39 no longer reach recipients in France or the rest of Europe. The volume of suspicious +39 calls received by French subscribers has therefore decreased, without any action on their part.
This filtering does not cover calls using spoofing, a technique that involves displaying a fake number in +39 while the call originates from another country. An Italian number displayed does not guarantee that the caller is physically in Italy or that they are using a legitimate line.
Dialing an Italian number from France: correct format and common mistakes
From a French mobile, the syntax is always the same: +39 followed by the complete number, zero included for landlines. From a landline or a box, you must replace the + with the international exit prefix 00, resulting in 0039.
- Call to a landline in Rome: +39 06 XXXX XXXX (mobile) or 0039 06 XXXX XXXX (box/landline)
- Call to an Italian mobile: +39 3XX XXX XXXX (mobile) or 0039 3XX XXX XXXX (box/landline)
- Classic error: removing the zero after 39 for a landline, which causes the call to fail without an explicit error message
Never remove the zero from an Italian landline number, contrary to the usual rule applicable in most other countries. This is the most frequent source of error when calling Italy.
Billing depends on your plan. Calls to Italy from mainland France are included in many recent mobile plans, but calls made from a fixed box are often charged by the minute. Checking your operator’s conditions before dialing remains the most reliable reflex to avoid an unpleasant surprise on your bill.
The code +39, the retention of the zero, the distinction between landline/mobile by the first digit, and the enhanced filtering by AGCOM form a set of concrete markers to identify the nature of an Italian call. A number in +39 06 that corresponds to an expected Roman contact poses no problem. An unknown +39 37x, received without context, justifies letting it ring and checking the number afterward on a reporting platform.
