Area Code 37 – Mobile Network
The phone area code for Mobile Network is 37 (international format +3937). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 37
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Overview of Italy's +39 37 Mobile Prefix
The Italian national dialing plan, governed by the Autorità per le Garanzie nelle Comunicazioni (AGCOM) and following ITU-T E.164 recommendations, assigns the prefix 37 as a non-geographic mobile network code. Unlike geographic area codes (e.g., 02 for Milan, 06 for Rome), the 37 prefix is not tied to any physical location. It is allocated to Mobile Network Operators (MNOs) and Mobile Virtual Network Operators (MVNOs) operating in Italy. When dialing an Italian mobile number that begins with 37, the full international format is +39 37X XXX XXXX, where 'X' represents additional digits. The total number length is 9 to 10 digits after the country code, excluding the leading trunk prefix '0' used for domestic calls.
Dialing Formats and Usage
For callers within Italy, a number with the 37 prefix must be dialed in the national format: 37X XXX XXXX (without the leading '0' that is used for geographic numbers). For international callers, the format is +39 37X XXX XXXX (or 0039 37X XXX XXXX from many countries). The 37 prefix is used exclusively for mobile services, supporting voice, SMS, and data. It is not used for fixed-line, toll-free, or premium-rate services.
Number Portability and Routing
Italy implemented mobile number portability (MNP) in 2002, allowing subscribers to retain their mobile number, including those starting with 37, when switching operators. As a result, the prefix 37 does not necessarily indicate the current network operator; it only reflects the original allocation. For routing purposes, the prefix is used to identify the mobile network, but actual routing is determined by a central database (Number Portability Database) that maps the number to its current operator.
Regulatory and Technical Considerations
The 37 prefix is part of the Italian national numbering plan, which is managed by the Ministry of Economic Development and AGCOM. Operators holding licenses for mobile services are assigned specific number ranges within the 37 prefix. These numbers are used for both personal and business mobile lines, and they support international roaming and interconnectivity with other networks. For VoIP or fixed-line callers, dialing a 37 number is treated as a call to a mobile network, and termination charges may apply depending on the caller's plan.
In summary, the +39 37 prefix is a vital component of Italy's mobile telecommunications infrastructure, offering a non-geographic, portable numbering resource for millions of subscribers. Understanding its dialing formats and regulatory context is essential for both domestic and international callers.