Close-up look at Nokia's new Windows phones

Nokia has unveiled its first handsets powered by Microsoft's Windows Phone 8 operating system.

The flagship device - the Lumia 920 - features wireless charging and a "PureView" camera which the mobile firm said offered better video and still images than rival smartphones.

The BBC's technology correspondent Rory Cellan-Jones was joined by Nokia's Peter Schneider to look at what sets the phone apart from its rivals.