Apple iOS 5 is, arguably, the version we've always been waiting for. New iOS builds have always introduced new features, but in iOS 5 Apple sets out its digital hub ecosystem, the culmination of a decade of product positioning and service development. It also brings very specific challenges to each of Apple's key competitors - Siri as the answer to Android's voice command system, iMessage to take on BlackBerry Messenger - in addition to addressing some of the longer standing complaints iOS users have had. Read on for the full SlashGear review. Be sure to also check out our iPhone 4S review!