There are drug stores and department stores who offer calling card. You can also buy them from many shops in any touristy area, or from vending machines in high-traffic areas. I don't know if you heard about the virtual calling card. The advantage of this card is that when you are out of calling minutes, you can recharge it directly using your online account. But you need to subscribe for the service.
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Also you can buy a virtual calling card in the internet.
Look at the site in the "related links"
Note: when buying a calling card, be sure to check the fees that apply. Many calling cards charge a monthly "maintenance fee," and may also charge a per-call fee in addition to the per-minute fee. These fees can use up a significant portion of the face value of the calling card.
Calling Card generally provide perfectly good voice calling services
There are several websites that allows one to purchase a calling card. Calling Card's official website offers their users to purchase a calling card directly from their webpage.
A calling card is a small phone card like a credit card which is used for calling purposes. It can be used with a landline or a cell phone to pay for telephone services.
There are three main benefits of having a calling card. It is cheap, reliable and convenient. For more details regarding a calling card, I recommend you check this. http://www.pingo.com/
Size and shape of the calling card is like credit/debit card. These cards are used to make domesic and international calls.
Follow the instructions on the card.
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You can get international calling cards online from the following sources: Tesco Phone Shop, Calling Card Plus, Calling Cards, Speedy Pin, Ontario Phone Card, to name a few.
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Calling Card Plus offers prepaid phone cards that can be used for international calls as well as domestic. They also sell rechargeable calling cards.
A person who would like to start a calling card business would first need to create a card. Some websites offer options to create calling cards for their business.