Video: Upgrading to iOS 9? Here Are Some New Hidden Features

Apple CEO Tim Cook waves during the Apple event In San Francisco, Sept. 9, 2015.

Apple CEO Tim Cook waves during the Apple event In San Francisco, Sept. 9, 2015. Eric Risberg/AP

Multitaskers should rejoice.

For iPhone users who have just upgraded to iOS 9 or are about to, the new operating system comes with a few surprises. 

The "settings" app now has a search bar, which means users can more easily navigate and customize basic settings. 

A new feature in email, called "Markup," lets users draw on attachments and send them back. This feature has a variety of uses, but most important, it allows you to add signatures to documents. 

One of the biggest surprises is the "back" button. Seen in the top left of the screen, tap it and you can return to the previous app. Users can multitask much easier.

To learn about all of iOS 9's secrets, check out the video below from CNET