Just when you thought you knew every in and out of your iPhone, a new "secret" function makes itself known.

The calculator app has many faces, more often than not moonlighting as a restaurant bill divider, but it's been keeping one little function from us all this time: the ability to swipe to delete mistyped numbers. Now, this may not seem like a huge deal, but if you're dealing with a lot of number combinations and you accidentally type "3" instead of "4" when you're already 14 divisions into an equation, this is a game-changer.

So, how do you swipe to delete numbers? It's easy. When you come across an errant number, simply swipe the calculating window (where the numbers are) and watch your last entry magically disappear. You can swipe either way, left or right, to make this happen.

There you go. Never again will you be stuck longer than necessary at a table full of semi-drunk brunchers waiting to find out how much of the bill they owe. You're welcome.