In order to use iCloud, you need to have an Apple ID. An Apple ID is also required to buy media from iTunes and apps and games from the App Store. You'll also need an Apple ID if you plan on using services such as FaceTime or iMessage. In other words, to get the most out of your devices, you need an Apple ID! Luckily, if you don't already have one, Apple has made it easy to set up right from your iPhone or iPad!
Full story from the iMore Blog...
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