The prefix +39 identifies a call coming from Italy, or at least a number registered on the Italian telephone network. Assigned as early as 1949 by the International Telecommunication Union, this code is part of the historical European country codes. Its technical peculiarity, often overlooked, distinguishes it from almost all other codes in the world.
Prefix +39 and initial zero: an exception in international numbering
The majority of countries apply a simple rule: when dialing a number from abroad, the zero preceding the area code is dropped. For France, for example, the 01 of Paris becomes 1 after +33.
Italy does not follow this convention. Since a reform in 1998, the initial zero of Italian landline numbers is retained, even when making an international call. Dialing +39 06 followed by the number remains mandatory to reach Rome, just as +39 02 is required for Milan. Removing this zero by reflex, as one would do for any other country, results in the call failing without an explicit error message.
Italian mobile phone numbers follow a different logic. They start with the digit 3 (for example, 3XX XXX XXXX) and have never included an initial zero. To reach an Italian mobile from abroad, the sequence is therefore +39 3XX XXX XXXX, without ambiguity.
Anyone wishing to understand the prefix +39 and its origin with Voyagoo will find a comprehensive analysis of this peculiarity and its practical implications.
Spoofing and the Italian prefix: what AGCOM regulation changes since 2024
Receiving a call displayed as +39 no longer guarantees that the call actually comes from Italy. This is a point that traditional guides on telephone codes do not address, even though it significantly alters the way to identify an incoming call.
The Italian communications authority (AGCOM) has published the delibera 106/24/CONS, which organizes the blocking of calls from abroad when they display a falsified Italian number. This measure, implemented in 2024 for landlines, was extended to mobile numbers in 2025.
The goal is to combat caller ID spoofing, a technique used in abusive telemarketing campaigns and fraud attempts. The prefix +39 is among the codes frequently exploited in such operations, as noted in several European reports, including a Finnish news article from August 2026 that lists the Italian prefix among the country codes commonly observed in fraudulent calls.
A second delibera, 21/26/CIR published in August 2026, regulates new formats for presenting the caller’s identity. The display of the number on the recipient’s screen no longer relies solely on the data transmitted by the originating operator but incorporates verification mechanisms on the Italian network side.
In practice, a call displayed as +39 can now be blocked before reaching the recipient if the network detects an inconsistency between the actual origin of the call and the presented number. Field reports vary on the complete effectiveness of this filtering, but the regulatory framework is established.
Italian area codes: what the first digits after +39 reveal
Italian landline numbers include an area code that provides geographical information. The main codes are well identified:
- 06 corresponds to Rome and its metropolitan area. It is the most recognizable prefix of the Italian landline network.
- 02 identifies Milan, the second most common area code in international business exchanges.
- Other major cities each have their code: 055 for Florence, 081 for Naples, 041 for Venice, 011 for Turin.
The length of the area code varies: two digits for the largest cities (Rome, Milan), three or four digits for less populated areas, such as islands or rural municipalities. The total number of digits in an Italian number is not fixed, which can be confusing. A complete Roman number (including the area code) generally has nine or ten digits, while a mobile number has ten.
This variability is a legacy of the Italian analog telephone network, which was never fully harmonized to a uniform format as France did with its systematic ten-digit numbers.
Calling Italy from France: dialing sequence and cost
From a French mobile, the dialing still follows the same pattern: the + sign (obtained by a long press on the 0 key), then 39, followed by the complete Italian number with its initial zero for a landline, or directly the 3 for a mobile.
- To a Roman landline: +39 06 XXXX XXXX
- To an Italian mobile: +39 3XX XXX XXXX
- From a French landline: 00 39 followed by the complete number
French mobile plans now mostly include calls to Italian landlines and mobiles from France, due to European roaming regulations. However, calls from Italy to France with a French plan fall under roaming and may incur charges depending on the operator and the plan subscribed, even within the European Union for prolonged use.
Telemarketing and Italian numbers: a changing regulatory context
Italy tightened regulations in 2025 regarding telemarketing in the energy and gas sector. Registered operators must adhere to stricter rules on identifying outgoing calls and obtaining recipients’ consent.
This regulatory strengthening occurs in a context where unwanted calls remain a massive problem in Italy. AGCOM has also regulated the use of three-digit short numbers, often used by call centers, to limit misleading practices.
An incoming call displayed as +39 followed by a short or atypical number deserves particular vigilance. Classic mobile numbers (starting with 3) and known area codes remain the most reliable formats for identifying a legitimate correspondent. When faced with an unknown number displayed as +39, checking the area code or mobile prefix allows for an initial screening before answering.
