Phone cards or also called as calling cards are just like credit cards but are used to pay for telephone services. They can employ either the credit card system of credit or prepaid credit system in which the card is purchased with a specific balance, from there the cost of calls made is deducted. Prepaid credit system is the most popular and common nowadays than the credit card system of calling card. The price in calling cards has dropped quite a lot since the prologue of VOIP technology. Though VOIP is cheaper, still calling cards have their own value.
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