Phone calls Windows Phone 8 vs. Windows Phone 8.1

Problem:

I am migrating a windows phone 8 app to windows phone 8.1.  The move forward involved changes to the namespaces where the phone tasks occur

Solution:

Making a call in Windows Phone 8

1. Add the following statement to your code.

   using Microsoft.Phone.Tasks;

2. Add the following code to your application wherever you need it, such as in a button click event. To test this procedure, you can put the code in the page constructor. This is the code to launch the task.
   
   

   PhoneCallTask phoneCallTask = new PhoneCallTask();
   phoneCallTask.PhoneNumber = "2065550123";
   phoneCallTask.DisplayName = "Gage";
   phoneCallTask.Show(); 

Making a call in Windows Phone 8.1

Add the following code to your application wherever you need it, such as in a button click event. To test this procedure, you can put the code in the page constructor. This is the code to launch the task.

Windows.ApplicationModel.Calls.PhoneCallManager.ShowPhoneCallUI("phone number", "display name");

Source:

1. https://msdn.microsoft.com/de-de/library/windows/apps/hh394025(v=vs.105).aspx
2. http://stackoverflow.com/questions/23555640/make-a-phone-call-in-windows-phone-8-1