I bought a prepaid card at Sam's. 600 minutes for $22. AT& T is the provider - the service is very good - no busy signals, clear sound and the call always goes through. There is a minute multiplier for each country. My experience is generally five minutes charged for each minute used to Europe. Works well for U.S. to Europe. The AT& T web site gives the number to call while in Europe to send a call back to the U.S. No problems with calls back to the U.S.

Jim in Houston