How do you call America from Australia?

The telephone country code for North America (USA, Canada, etc.) is +1, followed by a three-digit area code and a 7-digit subscriber number.

To call from Australia, on a mobile phone just enter the number in international format; for example, +1 303 555 0123. If you are calling from a landline phone, substitute the appropriate international dialing prefix for the plus symbol. The default prefix from Australia is 0011, but there are other prefixes for certain special purposes. Consult your long distance company if you are not sure which prefix to use for international calls.