It's really very simple. Each phone card has a toll free number or/and local access number. It also has a "PIN" (Personal Identification Number) (it is also called as account number or authorization number sometimes). Just call the toll free number or local access number, enter your "PIN" after which you'll be prompted to enter the destination phone number that you're calling. To call a destination number outside the North America, the general rule is to dial: 011-country code-area (city) code; then the local phone number. To call North American phone number, dial 1-area code-phone number. Please do not add any prefix "0" before country code and area code.