You will have to purchase a prepaid calling card before you can make a call; thus, prepaid. Unlike the post paid plans, you will no longer have to wait for the end of the month before you can know the total amount that you will have to pay. Saving is more possible as you will not be able to make a call when you don't buy a card.
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[Source: Communications Articles from EzineArticles.com - Posted by FreeAutoBlogger]