Apple's iOS 9, now available as a free download, offers the usual collection of headline new features -- including, this time around, multitasking support on the iPad, upgrades and additions to the built-in apps (Notes, Maps, News), richer interactions with and more intelligent search from Siri, and power optimisation that, Apple claims, provides an extra hour's battery life for the average user.

Apple has always had impressive uptake rates for new versions of its mobile OS, and iOS 9 is no different. According to mobile and web analytics developer Mixpan ...

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