What is the best way to make long distance calls?

If i was going to make long distant on a 3g active cellphone, what is the best way to do it cheap or free if possible?

    Get a VoIP service on your phone. Voice over Internet protocol converts your voice (which is analog format) into small digital IP packets and send it over the Internet to the required destination. Since it utilises the cost effective Internet service, the call tariff for international long distance calling is in turn very affordable. You can save up to 50% on your monthly phone bill.

    You can also choose to go with a carrier that offer low cost long distance calling or cheap unlimited long distance add-on for your plan.

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