Recommended:

In order to save on both international and domestic phone calls we recommend you to use prepaid international phone cards (or calling cards). Rates for international and long distance calls of such calling cards are usually several times lower than rates of your local telephone company. Although such calls are still more expensive than VoIP calls, prepaid phone cards is a good alternative for IP telephony. Callingcom is another place where you can buy worldwide long distance phone cards at low prices. Phone cards are delivered by email and activated instantly.