iOS 11 is available, officially, today. It’s coming to every iPhone and iPad made in the past few years, and chances are, you’re going to upgrade. When you install it on your iPhone, you’ll find that some things are very different than what you’re used to, but the core of how you get around and experience the OS will be the same. For example: the Control Center is wildly different and notifications have changed slightly, but you still have that comfortable (and comforting) grid of apps on the home screen. A lot is new, but not so much that you can’t recognize it.
iOS 11 review: Control Center, multitasking, and much more – The Verge