If you have ever tried to make an international phone call from a home phone that is on a regular calling plan than you already know how expensive that one international call may be. The telephone companies charge astronomical rates to make telephone calls to other countries. The one way to save a ton of money on international telephone calls is to purchase a phone card. Phone cards are generally sold in different denominations of minutes. Phone cards charge different rates per minute depending on which country in the world that you are trying to call. Some phone cards will offer a few extra free minutes if you purchase the phone cards with a higher amount of minutes.