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re are many types of phone cards available to those who travel abroad and require keeping communication with the world they are leaving behind. Among these, the stored value cards are so called because the cards contain stored balance that is available to you as you use the card. The public payphone booth machines read the balance available with the card. The phone reads it as you insert the calling cards in the phone machine's card reader. It is normal for you to draw an analogy with a banks' automated teller machine, as it is almost similar to a phone's card reader.
A value can be encoded on the card in various ways. Over the years, it has adopted many technologies and flourished for the better. In the year 1976 [link widoczny dla zalogowanych], in Italy [link widoczny dla zalogowanych], a technology was introduced that is similar to present days ATMs, which used magnetic stripes as information carrier.
The next technological advancement that the calling cards adopted used the optical storage. The cards are so named due to a visible mark on the cards so that the stored international phone cards holder can look for such a mark and know about his/her balance. However, such technologies are quite simple and more easily hackable. For this reason, it has sidelined and has given way to other safe technologies.
The third level of advancement that the calling cards brought about the stored value phone cards is the chip cards. It was first introduced in the year 1986 in Germany. The phone cards later went on to be more attractive and smart for everyone to afford. This technology also had its drawbacks, as they were also hackable when initially they used microchips by destroying the programming voltage contact on the card by scratching it. The stored calling cards platform can be accessed with several methods. The toll free methods cost higher to the calling cards companies than other methods. The local calling cards are cheaper than the other methods and are thus more popular.
Once you are connected to get prepaid phone cards, an exclusive pin number authenticates you or a chip that is embedded on the cards does. Before you receive the offer to make a second call, you are validated and given a balance value that is left on the card as your stored balance. The stored phone cards gives you warning when you have just one minute left for your balance to finish so that you can refill your balance for further facility of telecommunicating.
If you want to avoid higher roaming charges or if you do not have a cell phone, phone cards is definitely the best solution for you.
Smart-Phone-Cards.com offers phone cards, prepaid phone cards, international calling card for Russia, India, China & other countries at affordable prices.

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