How to use the phone call task

using Microsoft.Phone.Tasks;


PhoneCallTask phoneCallTask = new PhoneCallTask();

phoneCallTask.PhoneNumber = "2065550123";
phoneCallTask.DisplayName = "Gage";

phoneCallTask.Show();

Source:

http://msdn.microsoft.com/en-us/library/windowsphone/develop/hh394025(v=vs.105).aspx