You will first dial the toll-free access number provided at purchase or in the email. Next, you will enter the PIN number provided at the time of purchase or email, then last, for international calls, you will dial "011", then the Country Code, then the City Code (if applicable), then the telephone number you wish to call.
For US domestic calls, dial "1", then the area code then the telephone number you wish to call.
At the beginning of each call, you are notified how many minutes are remaining. When your card has one minute remaining, you are notified during your conversation.