Area Code 0165 – Aosta Valley
The phone area code for Aosta Valley is 0165 (international format +390165). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 0165
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Aosta Valley
Geographic Coverage and Administrative Context
The Italian area code 0165 is the National Destination Code (NDC) for the Aosta Valley (Valle d'Aosta / Vallée d'Aoste), a special-status autonomous region in northwestern Italy. This geographic prefix serves the entire regional territory, including the capital city of Aosta (Aoste in French) and its surrounding municipalities, such as Courmayeur, Saint-Vincent, Châtillon, and Sarre. The region is bordered by France and Switzerland, and the code is exclusively assigned to fixed-line services within this administrative area.
Dialing Formats and Caller Instructions
For local callers within Italy, the number is dialed in the national format: 0165 XXXXXX, where the prefix is an integral part of the subscriber number. For international callers, the Italian country code (+39) is added, resulting in the format: +39 0165 XXXXXX. It is important to note that Italian fixed-line numbers are not truncated when dialed internationally; the leading '0' of the area code is always retained after the country code. For example, a typical number in Aosta might be dialed as +39 0165 123456 from abroad.
Numbering Plan and Overlay Considerations
Italian geographic numbers have a variable length, typically 6 to 11 digits including the prefix. In the Aosta Valley, subscriber numbers are usually 6 or 7 digits long, making the complete national number 9 or 10 digits. There is no overlay code for this area; the 0165 prefix remains the sole geographic code for the region. The numbering plan is regulated by the Autorità per le Garanzie nelle Comunicazioni (AGCOM), and number portability allows subscribers to retain their numbers when switching operators, though the geographic significance is preserved for fixed-line services.
Practical Usage and Routing
For businesses and residents in the Aosta Valley, the 0165 code is essential for local telecommunications. Calls from mobile phones within Italy to 0165 numbers are charged at rates determined by the caller's mobile plan, and there are no special premium rates. Since the region is a popular tourist destination, international visitors should be aware that dialing a local number requires the full international format, including the +39 prefix. VoIP services and virtual numbers may also use the 0165 code, allowing businesses to establish a local presence without physical offices, but these are subject to the same dialing rules.