The iPhone has never had an LED notification light like some Android handsets have, but you can use the flash around the back of the phone instead to alert you to new messages and updates.
If your iPhone is in quiet mode or sat on its back it gives you a subtle visual cue that something's happening — here's how to set it up.
This is by no means a new feature in iOS — it's been doing the rounds for years now — but if you've recently made the switch to the iPhone or you've never taken much time to explore its features, then you might not be aware of it. It's one of those hidden settings that's easy to miss if you're not specifically looking for it.
The setting you want to enable can be found in the Accessibility section of the General screen, inside the main Settings app. Toggle the LED Flash for Alerts switch to on, and every iPhone notification then results in a small blip of the LED flash — it's primarily designed for those with hearing difficulties but it's a handy option for any iPhone user.