If you've yet to make the move to i OS 10, or just want to ensure you have the latest version of it on your device, this article is for you: we show you how to make the update quickly, easily and safely.
We take you through how to download, install and run the latest version of i OS on your i Phone and i Pad, potential problems you may encounter, and whether you should let Apple update your i Phone or i Pad for you overnight.
The passcode is the key to your device, which protects it so others can't view your email or photos, or access your personal information.
i OS 10 launched on 13 September 2016, bringing with it a number of new additions and refinements; since then Apple has launched a series of smaller upgrades with patches and minor new features.
All have been made available to i Pad & i Phone users for free (assuming your device is a recent enough model to qualify).
and that is no longer the case for i OS 9 or most of the earlier builds of i OS 10.
Read next: Should you update to i OS 10 on your i Phone or i Pad?