FREE CALLS ON YOUR iPHONE
Skype for iPhone
Add free Skype to Skype calls to your iPhone. This application can be use both on the iPhone and iPod Touch gadgets.
You can do Free Skype-to-Skype calls from any WiFi zone. The possibilities to Call phones and mobiles from your iPhone contacts at great rates¹. You will be able to see who’s online and send and receive instant messages on the move.
Most 3G networks should support Skype presence and chat. However, Skype calling is not possible via the iPhone. Please note that data usage costs apply for using Skype over 3G mobile networks, so we recommend an unlimited data plan.
Skype presence and chat will work on all iPod touches. However, calling is only available on the iPod touch (2nd Generation) because Apple does not support microphones on the 1st generation.
The Skype application must be started and signed in to receive incoming Skype calls and chats. If the application has been closed, incoming Skype calls cannot be received and chats will not be delivered.
http://www.skype.com/intl/en/download/skype/iphone/?cm_mmc=PAIDS|GAWC-_-EMEAF|SA|EN-_-BD|IPHON-_-zfyvhf
iCall for the iPhone
iCall for the iPhone is a revolutionary new product that lets you make and receive free or low-cost phone calls anywhere you have a WiFi Internet connection.
With iCall, you can call anywhere in the world at the best rates around. Unlimited US and Canadian calling is included in our iCall Total Access calling plan, and costs just 2.1¢ per minute on our pay as you go option.
http://www.icall.com/iphone/
Jajah on iPhone = Free phone calls
Jajah works on the Apple iPhone. Jajah allows for free worldwide calling. Pretty simple to call someone using the iPhone which gets you free worldwide calls. It isn't as easy as directly dialing someone, but it's pretty close. You will of course use your bucket of voice minutes in your AT&T plan, but hey, it's free calls anywhere in the world.