Three times a year, Ewan Spence heads out for a major tech event. And we do like to kit him out with something fairly cutting edge, to put the smartphone through its paces in a way that might not be possible staying at home. All tinged with Ewan's own unique take on life and expectations. In this, the final (bumper length!) part 4 of a video diary from BlogWorld Expo in Los Angeles, he reports on day four with the Nokia Lumia 800, running Windows Phone Mango, in which he rounds up whether it met his expectations, looking at both hardware and software/apps.