Windows Phone Device Model and Version in Windows Phone Silverlight 8.1 App

MainPage.Xaml

<Grid x:Name="LayoutRoot" Background="LightBlue">
    <TextBlock Text="Windows Model :" TextWrapping="Wrap" FontSize="20" Foreground="Gray" Margin="148,284,167,449" />
    <TextBlock Name="txtModel" TextWrapping="Wrap" FontSize="24" Foreground="Gray" Margin="130,310,135,423" />
    <TextBlock Text="Windows Version :" TextWrapping="Wrap" FontSize="20" Foreground="Gray" Margin="142,344,163,397" />
    <TextBlock Name="txtVrsn" TextWrapping="Wrap" FontSize="24" Foreground="Gray" Margin="28,370,26,358" />
</Grid>

MainPage.Xaml.cs

public MainPage()
{
    InitializeComponent();
    var phone = PhoneNameResolver.Resolve(DeviceStatus.DeviceManufacturer, DeviceStatus.DeviceName);
    txtModel.Text = Convert.ToString(phone.FullCanonicalName);
    txtVrsn.Text = Convert.ToString(System.Environment.OSVersion);


}