Calling cards that you are using no longer satisfy you?
Here are clear and simple solutions. Here are some prepaid phone cards that will force you to forget your present discomforts:

For a short-term, if you want to make a lot of long calls, use calling cards that have low rates.
Usually, they have a maintenance fee:

The card is at least twice as cheap as other cards for the same destination.
Remember: the faster you use the calling card, the less amount of maintenance fee will be deducted from the balance.

World Asia Card

For a long-term, if you make phone calls just once in a while or if you do not like a maintenance fee, use: