AT&T's Call International App Gives Smartphones VoIP Calling
AT&T announced the availability of a new application today called AT&T Call International. This application allows AT&T smartphones to make VoIP-based calls over Wi-Fi to international numbers at low/reduced rates. The application also works abroad, and will let AT&T smartphone customers make calls from foreign countries to the U.S. via Wi-Fi for rates that are lower than its standard roaming cellular voice minutes. The application itself is free to download, and is available from the Android Market, BlackBerry App World, and the iPhone App Store. Calling rates vary by country, and are billed directly to customers' credit cards.
ATT Lame attempt
I have a better idea