By downloading iOS 7.x to your iPhone or iPad, you are giving up all your data and the ability to do things like control the device and take pictures.
The software update, which was released last week, is available in both the iPhone and iPad app stores.
However, the Mac version is only available in Apple’s App Store, while the Windows version is available on Windows 10.
The update is free to download and install, but you need to set up your Mac or PC before you can do so.
Apple is offering a free trial to anyone who pre-orders iOS 7, the latest version of the iOS operating system.
The Mac version will cost $39.99.