Italy Phone Numbers: Format, Area Code & Validation Guide - phone-number-standards -

Frequently Asked Questions

Use the E.164 format, which includes a plus sign (+), the country code (39 for Italy), and the national number. For example, a national number like 02 12345678 becomes +39 2 12345678 in E.164. Remember to retain the leading zero for landlines after the country code.
Italian landline numbers follow the format 0xx[x] + XXXXXXX, where 0 is the trunk prefix, xx[x] is a 2-4 digit area code, and XXXXXXX is a 6-8 digit subscriber number. The area code is mandatory, even for local calls.
While regular expressions like /^0\d{2,3}\d{6,8}$/ for landlines and /^3[1-9]\d{7,8}$/ for mobiles can be used for basic validation, they are not foolproof due to number portability. Always validate against AGCOM's official database for definitive results.
Number portability allows users to switch providers while keeping their number. This means the prefix or area code no longer definitively identifies the carrier, making simple regex validation unreliable. Checking against AGCOM's database becomes essential for accurate validation.
AGCOM (Autorit?? per le Garanzie nelle Comunicazioni) regulates Italy's telecommunications sector. It focuses on enhancing service quality, protecting consumers, streamlining digital integration, and improving number portability, all in line with EU directives.
Italian mobile numbers begin with a 3, followed by a 1-2 digit carrier identifier and a 7-8 digit subscriber number (3XY XXXXXXX). For instance, 339 1234567 is a valid mobile number format.
The standard European emergency number, 112, is used in Italy. It's classified as a special service number within the Italian numbering plan.
E.164 formatting is crucial for international compatibility. Always store and transmit phone numbers in E.164 format (+39 followed by the national number, including the leading zero for landlines) to ensure seamless global communication.
Toll-free numbers in Italy start with 800, followed by six digits (800 XXXXXX). Premium-rate numbers, where the caller incurs additional charges, begin with 89X XXXXXX.
Landline numbers can be ported, but only within the same geographic area code. They cannot be ported to a mobile network. Mobile numbers, however, can be ported between mobile operators while retaining the same number.
Under GDPR, phone numbers are personal data. Protect them by encrypting stored numbers, restricting access, minimizing data collection, and adhering to purpose limitation, using numbers only for their intended use.
The Italian Electronic Communications Code modernizes the telecommunications framework, focusing on enhanced service quality, stronger consumer protection, streamlined digital integration, and improved number portability, reflecting broader EU initiatives.
Cache compiled regular expressions and frequently accessed data like area codes to speed up validation. Implement rate limiting to prevent abuse of validation APIs and improve overall system performance.
Normalize input by removing non-numeric characters, store numbers in E.164 format, validate against AGCOM's official database, implement robust security measures, and monitor validation performance and error rates for continuous improvement.
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