Apple packs a slew of useful features into iOS – the mobile operating system that powers the iPhone, iPod Touch and iPad.
However, the technology company doesn't have the time to tell users about every single one of these in-built features.
If you're ever in need to quickly redial the last number you called from your iPhone, there's a shortcut that will save you a few taps.
Launch the Phone app (the green iOS app with the picture of the telephone handset).
But instead of tapping on the Recents tab (with the picture of the clock face), just tap on the green call button in the main keypad screen.
When you tap the phone icon, the last number you dialled is automatically populated into the dialler.
However the iPhone will not automatically initiate the call.
So not only is the shortcut incredibly useful when it comes to quickly redialling the last number you called, but since it doesn't make the call, you can also use it to check where you went wrong if you called the wrong number.
It's also pretty useful if you need to add a new extension to number you've already dialled earlier in the day.