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...