Dell Canada has teamed up with Fongo to offer free VOIP based calling to many Canadian cities through it new iphone/Android/Windows (RIM coming next month) application. After you download the app, you complete a simple registration and validation process and voila, free calling. You also get a free telephone number, caller ID, voicemail and e911 service.  Their long distance rates also seem very reasonable.

Dell voice website.

 

Android

iPhone

Windows