To call the United States from Italy, you need to dial the exit code for Italy (00), followed by the country code for the United States (1), and then the area code and phone number. For example, to call a landline in New York City, you would dial 001 212 XXX-XXXX. To call a mobile phone in the United States, you would dial 001 XXX-XXX-XXXX.
There are a few things to keep in mind when calling the United States from Italy. First, you will need to use a phone that is compatible with the GSM network. Second, you will need to have a calling plan that includes international calling. Third, you may be charged a roaming fee by your Italian mobile phone provider.