The latest iPhones, the 6s and 6s Plus, will come with iOS 9 built in

Apple's iOS 9 mobile software available from today

Apple's latest mobile operating system, iOS 9, becomes available today. The company says the update makes its devices more secure and more productive.

The software will be built into the latest generation of iPhones, the 6s and 6s Plus, due for release in just over a week. Users with an iPhone 4s or newer, as well as owners of an iPad 2 or newer, will receive a notification today telling them they can download the new iOS.

The update includes improved security features, with default pin codes now six digits long rather than four, which Apple says makes a user's devices more immune to hacking as it increases the possible combinations from 10,000 to one million.

Two-factor authentication, where a second layer is added to log-in, is also being introduced, with users now required to enter a code when they log in from a new device for the first time. This code will be sent to and displayed on a user's other Apple products.

On the iPad, users will be able to split the screen between two apps for the first time, bringing a capability to Apple's devices already available on rival platform Android.

The new feature will allow the user to use both apps at once, as well as also playing a video or taking a FaceTime video call using picture-in-picture mode, which the company says will enable iPad users to "make even better use of its large screen".

Apple also says that iOS 9 will help to improve the battery life on some devices, thanks to power efficiency improvements included in the app software, while its Maps app, which has previously struggled with reliability issues, has also been updated as well.

Maps will now show public transport options routes for the first time, like Google Maps does, although the feature is only applicable to selected cities.

Rival Google is also set to release an update of its own Android operating system - code-named Marshmallow - later this year.

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