Free Call

Fring lets You Make Free Calls to Anywhere
Fring is an excellent mobile application that lets you talk and chat with your IM contacts using handset’s internet connection. Fring users make free mobile calls, video calls, live chat & more, from their mobile phone with all their friends on fring & other internet services.

NetTalk - Free Phone Calls to US & Canada
NetTalk.com is now offering a free app, netTALK, allowing users to make free phone calls anywhere within (or to) Canada and the U.S. Unlike Skype, netTalk lets you call any landline or cell phone at no cost. You can only make outgoing calls at this point in time.