Hang Up a Phone Call on the iPhone by Tapping the Power Button
Many of us use our iPhones for so many tasks that it’s easy to overlook some of the simpler functionality of the device, like making and ending phone calls. With that in mind, we’ve got a nice trick to hang up an active call faster, without having to touch the devices screen at all. It’s incredibly simple:
Hang up a call instantly by tapping the Sleep / Power button

Yes, the sleep/lock/power button at the top of the iPhone can also be used to hang up a call, without having to rely on touching the iPhone screen.
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