How to use namespace - Microsoft.Phone.Info - in native C++ on in WP 8.1 or WP 8

I'm working in a native C++ enviroment on WP8.1.

Let's say I want to call a functions like

Microsoft.Phone.Info::DeviceExtendedProperties.GetValue( "DeviceUniqueId" );

The problem is no matter how I try, it didn't pass compile.

I know "Microsoft.Phone.Info" is a name space,

in C# ppl wrote:

using Microsoft.Phone.Info;

but in C++, I tried

using namespace Microsoft.Phone.Info;

void func()
{
    DeviceExtendedProperties.GetValue("DeviceUniqueId");
}

didn't pass compile. or

void func()
{
    Microsoft.Phone.Info::DeviceExtendedProperties.GetValue("DeviceUniqueId");
}

didn't pass compile.

It keeps telling me something like this

'Microsoft' : illegal use of namespace identifier in expression

so how do I use this namespace properly?

Thank you guys for the reading and answering. :-) I can't find a C++ example for retriving the device ID. :-P