An Italian mobile number is everyday infrastructure: bank approvals, SPID recognition, landlord messages and ASL appointment texts all expect a +39 line. Airport SIMs work for the first week; a registered prepaid or contract line works for the first year.
What is the fastest path for a newcomer?
Prepaid SIMs from TIM, Vodafone, WindTre and Iliad are sold at airports, carrier stores and electronics shops in Milan, Rome and smaller cities. Bring a passport or EU identity card and a codice fiscale; registration is mandatory. You need an unlocked phone on compatible bands. Top up with cash, card or app, then test calls, SMS and data before you leave the shop.
Bill-pay plans usually want Italian address and IBAN details after banking and housing settle: How to rent a home. MVNOs can be cheaper once you know coverage on your real commute.
Why does the number matter for paperwork?
Banks and SPID providers send codes to a personal mobile you control: Get SPID and Paperwork after moving. Avoid a work handset you will return. Keep the same number when you change from tourist prepaid to a resident plan so OTPs do not break mid-permesso week.
Home broadband is a separate utility line once residenza is stable: Utilities, internet and transport. Coverage still varies in rural Sicily and Alpine valleys even when city centres look saturated.
Common misconceptions
Assuming a foreign eSIM replaces Italian KYC forever fails. Many resident services still want a registered +39 number.
Assuming you can skip the codice fiscale for a contract SIM also fails. Most carriers ask for it at activation.
Summary
Register a prepaid +39 line with ID and codice fiscale in the first days, then upgrade to a contract when address and IBAN are stable. Guard that number for bank and SPID codes through the whole paperwork chain.
Sources
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Related questions
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