just right and this is just a little bit too wide. The other blot on the Lumia 900's copy book is a slightly cheap, plasticky feel to the buttons and a little rattle from the camera button in particular. Are we being picky? Perhaps but given its track record and the engineering excellence it's up against in the iPhone, Nokia can't afford any mistakes. Back in the game Once you fire the Lumia up, Windows Phone comes to life. And if you've been using iOS or Symbian for a few years, it feels like a breath of fresh air. It's elegant, fluid and pleasurably different to use. First off, there's an aesthetic sensibility about the OS that we're more used to seeing from Apple. The fonts used, the fluid transitions that glue the various elements together: it all looks and feels first-rate. They're details of course but details add up and matter day-to-day. We liked stylish little touches like the dots that fly on and off the screen when you're waiting for something to download. We liked the way the foreground and background scroll at different rates as you swipe horizontally between screens. We liked holding the 'back' button down and being presented with cards representing all of our open apps. Details like this make for a relaxing and stylish OS. The element of the OS that most distinguishes Windows Phone though is the 'live tiles'. The idea here is that the Windows Phone home screen is a a hybrid