Phonedailer function with Serialport

Question

I am implementing a c# application that needs to be automatically dialed. Searching I found a function Phonedailer.Open that receives in parameter the number of the phone. However I do not know the next step. It follows code of the function:

public async void TesteLigação(string number)
    {
            try
            {
                PhoneDialer.Open(number);
            }
            catch (ArgumentNullException anEx)
            {
                // Number was null or white space
            }
            catch (FeatureNotSupportedException ex)
            {
                // Phone Dialer is not supported on this device.
            }
            catch (Exception ex)
            {
                // Other error has occurred.
            }
    }

Running only so it gives the following error:

{"This Functionality is not implemented in the Portable version of this Assembly. You should Reference the Nuget package from your main application project in order to Reference the Platform-specific implementation."}