Check out this great guide on how to setup iCloud for your iOS devices, After using it for a while I could’nt function without it now.
“If you recently picked up a new Mac, iPhone, iPod, or iPad, you may have seen mention of something called iCloud when setting up your device. If you don’t already know, iCloud is a free syncing and backup service from Apple that aims to keep all of your devices—mobile devices running iOS 5 or later and desktop computers running OS X Lion or later, or Windows Vista or later—on the same page, with the same data, no matter which one you’re using at any given moment.