I bought ten euros worth of credit with them to call Costa Rica from the USA, only to find out that all my calls are failing. I'd be more specific about what was happening except that's all the error message says: "Call failed" before the window disappears. I called tech support and they gave me some line about the dynamic nature of the Internet and the unreliability of overseas phone networks. I'm not sure exactly what to do with my ten euros of credit now.