Some of the prepaid international calling cards available from most long distance prepaid phone companies have an international access option.
That means that the same calling card can be used to call both from US to an international phone line and at the same time to call from an international location back to the US or to a different destination. Again, the same calling card pin can be used!
You don't pay anything extra for that, it's just some calling cards have this option while other long distance prepaid phone cards don't. It may be that rates vary from calling card to calling card based on the type and details. To learn more on international calling cards usage read the article on "How do calling cards work?"
Before going to the top calling card companies, please take your time to read also the rest of the material on calling cards details:
CALLING CARDS MENU PAGES
TOP long distance calling cards providers
USA (United States) ---> 0.8¢
INDIA ---> 8.3¢
UNITED KINGDOM ---> 0.95¢
CANADA ---> 0.89¢
ROMANIA ---> 6.40¢
GERMANY ---> 1.33¢
RUSSIA ---> 2.40¢
AUSTRALIA ---> 0.90¢
BULGARIA ---> 2.40¢
PAKISTAN ---> 7.00¢