Nokia today announced that the latest version of its home-grown smartphone platform, called Belle, is available to download. The new system software brings a refreshed look to the user interface as well as a number of under-the-hood improvements to the operating system. Belle is available to the N8, E7, E6, X7, C6-01, C7, and Oro handsets. Belle boosts the number of home screens from three to six and improves the performance of home screen widgets. The update is available in most countries, and Nokia says that it must be installed via the Nokia Suite desktop software over USB. The system update is free.