Quickly Hang Up a Call
Another great — and possibly annoying — way to use your side button is to quickly hang up a call.
Whenever you’re on the phone, you can quickly end the call by pressing the side button. This is great if you can’t reach your screen and don’t want to wait for the other person to hang up.
Of course, as we mentioned, it can also be annoying, as you can hang up any call by accident. The good news is this won’t hang up a call if you’re using wired or wireless headphones such as AirPods.
Nevertheless, if you don’t want to continue using this feature, all you need to do is go to Settings > Accessibility > Touch and enable Prevent Lock to End Call.