Making a phone call home from Italy, France, the UK or indeed anywhere else in Europe is easy since all countries in the European Union agreed on one standard way of making international calls. You dial two zeros (00), the country code, and then the number. The country code for the US is 1, so a call to the San Francisco number 415-555-1212 is dialed 00-1-415-555-1212.
Dialing works the same way on mobile phones, or you can use the shorthand of “+” instead of the two zeros. The benefit of this approach is that this works anywhere on any mobile phone network world-wide, not just in Europe — which is handy for numbers you put into the phone’s memory or contact list. In my example, you’d dial +1-415-555-1212, and this same number would work when dialed in the US as well as in Europe.
On regular land-line phones, you can speed up the connection by dialing a # at the end of the number (more precisely, this cuts short the “post dial delay”). This tells the phone network that you are done dialing your international number, and it starts connecting the call immediately. Otherwise, the phone network will sit and wait in case you want to dial any more digits — several seconds — because unlike domestic calls, the network doesn’t know the exact length of phone numbers for every area of every country. This isn’t required with mobile phones because you hit the “send” or “call” button at the end of the number.
One more thing about the ‘# at the end trick’: it works in the US too when dialing internationally. Try it and see!