I just tried this app and it works, sound quality could be a little better but it is free... They also have apps for any platform.There’s a hot new app that’s available in the App Store for free, called netTalk. This VoIP company has created an app for the iPhone that allows free calling to numbers to Canada and the USA over both 3G and WiFi (and even EDGE). It doesn’t use your daytime minutes, can’t receive incoming calls, and doesn’t show caller ID. But did I mention it allows for free calls?