Not all iPhones and iPads will be able to run iOS 11: anyone with an iPhone 5 or 5C, or iPad 4 or older is out of luck. But the majority of devices bought in the last few years will be able to download the update for free via the Settings app or through iTunes on a computer.
If you have any older apps installed that haven't been updated in a while, be warned that they may not work after installing iOS 11, as it drops support for 32-bit apps. Most will be fine, but you can find out if any of the apps you have installed on iOS 10 won't work before updating.
Control Center, the widget-filled settings screen that is found by swiping up from the bottom of the screen, has been redesigned to fit more on screen at once. But probably the best bit about it is you can now change what's on it. Want an alarm or stopwatch button? You got it.
There's still no way to go directly to the Settings app from it, but if you force press or long press on some of the widgets such as the wireless settings, you'll get a popup with more options.
Is there a such a thing as too many emoji? Either way, iOS 11 has a hatful of new options to spice up your messaging life. From breastfeeding mothers to zombies, pixies, a T-rex and a vomiting smiley, there's plenty to choose from.
Apple has always maintained that you don't really need access to a file system...