Area Code 015 – Biella

Geographic Overview and Administrative Jurisdiction

The Italian national destination code (NDC) 015 is a geographic area code assigned to the province of Biella, located in the Piedmont (Piemonte) region of northwestern Italy. The code covers the city of Biella and its surrounding municipalities, including Cossato, Vigliano Biellese, Candelo, and Trivero. Administratively, the area corresponds to the former Province of Biella, which was re-established in 1992. The numbering area is part of the Italian national numbering plan under ITU-T E.164, with the full international dialing format being +39 015 XXX XXX.

Dialing Formats and Caller Instructions

Within Italy, callers must dial the trunk prefix '0' followed by the area code and the subscriber number. For example, to call a landline in Biella from another Italian city, dial 015 XXX XXX. However, when calling from outside Italy, the leading '0' is omitted, and the international format becomes +39 15 XXX XXX (note: the '0' is not part of the country code). For local calls within the same area code, it is still necessary to dial the full 10-digit number (including the '015' prefix) because Italy uses closed dialing plan: no local number truncation is permitted. This applies to both fixed and mobile calls.

Geographic Coverage and Major Localities

The 015 area code serves the Biellese territory, which is characterized by the Alpine foothills and the Po Valley. Key towns and villages within this code include Biella (the provincial capital), Andorno Micca, Mosso, Pray, and Valle Mosso. The area is known for its textile industry and scenic landscapes, including the Oasi Zegna and the Sacro Monte di Oropa (a UNESCO World Heritage site). The code is exclusively used for fixed-line services, and no overlay codes have been introduced; therefore, 015 remains the sole geographic code for this region.

Technical and Regulatory Notes

As with all Italian geographic codes, numbers beginning with 015 are regulated by the Autorità per le Garanzie nelle Comunicazioni (AGCOM). Subscriber numbers under this code typically consist of 6 to 7 digits, resulting in a total national significant number (NSN) length of 9 to 10 digits (including the leading '0' for national dialing). Since the liberalization of telecommunications, users may retain their fixed-line numbers when switching operators (number portability), but the geographic significance remains tied to the physical location of the line. VoIP services may also be assigned numbers from this range, but they are still considered geographic and must be associated with a physical address in the Biella area.

Practical Examples for Callers

• Local call (within Italy): 015 1234567
• International call (from abroad): +39 15 1234567
• Call from a mobile phone in Italy: 015 1234567 (same as fixed)

For businesses, having a 015 number reinforces local presence and trust among customers in the Biella province. When dialing from abroad, always replace the initial '0' with the Italian country code +39.