After installing Whatsapp in my Nokia N8 phone why I'm not able to make phone calls?

u need to install the supported application for Nokia N8 ,,, u kniow i have a software it is called Bapstar*..this a software where u will save all ur Files , Pic, video ..directly to ur computer with out access ur computer ..the reason u r not able to make calls is not becoz of the application,,,u need to walk in to any nokia care and ask them to upgrade the service and adv them to reprogram..