Making a Phone Call from Australia to the USA involves dialing the international access code, followed by the country code for the USA (+1) and then the area code and phone number. For example, to call a number in New York City, you would dial 0011 + 1 + 212 + XXXXXXX.
International calling rates vary depending on your phone service provider and plan. It is generally cheaper to use a calling card or a VoIP service than to call directly from your landline or mobile phone.