Windows Phone 8 apps using Visual studio 2013 Professional [duplicate]

Answer 1

This question is a duplicate of Windows Phone 8 template in Visual Studio 2013 Preview but since I haven't got the reputation to post a comment, I'll combine JP Hellemons' answer and my own to answer this specific question.

The Windows Phone SDK 8.0 only incorperates into Visual Studio 2012, even when Visual Studio 2013 is installed. To install the SDK for VS2012, we need to specify this during the initial installation of Visual Studio or do it afterwards by modifying the installation via Control Panel → Add or remove programs.

Answer 2

Windows 8 (aka Metro) and Windows Phone are two distinct platforms. There's some speculation that the platforms will ultimately converge, but we are not there yet.

In order to start developing for Windows Phone you need to install the Windows Phone SDK. Unless you are using Visual Studio 2013 Ultimate which supposedly ships with the WP SDK pre-installed.