방법: Windows Phone의 전화 번호 저장 작업 사용

using Microsoft.Phone.Tasks;

SavePhoneNumberTask savePhoneNumberTask;

savePhoneNumberTask = new SavePhoneNumberTask();
savePhoneNumberTask.Completed += new EventHandler<TaskEventArgs>(savePhoneNumberTask_Completed);

try
{
    savePhoneNumberTask.PhoneNumber = "2065550123";

    savePhoneNumberTask.Show();
}
catch (System.InvalidOperationException ex)
{
    MessageBox.Show("An error occurred.");
}

void savePhoneNumberTask_Completed(object sender, TaskEventArgs e)
{
    switch (e.TaskResult)
    {
        //Logic for when the number was saved successfully
        case TaskResult.OK:
            MessageBox.Show("Phone number saved.");
            break;

        //Logic for when the task was cancelled by the user
        case TaskResult.Cancel:
            MessageBox.Show("Save cancelled.");
            break;

        //Logic for when the number could not be saved
        case TaskResult.None:
            MessageBox.Show("Phone number could not be saved.");
            break;
    }
}