New Security Features
iOS 9 will add some extra lines of defense that we think you'll be excited about if you have sensitive documents on your phone and use it for work.
The iOS 9 update supports a six digit passcode. This is going to make the device harder for thieves to get into. Remember, you have to input a passcode every time you restart the iPhone 5s. The Touch ID fingerprint sensor only goes so far.
iOS 9 also brings two-factor authentication. When you "sign in from a new browser or on a new device, you’ll be prompted for a verification code." This code will be pushed to your phone or another Apple devices to ensure that it's you, and not someone else, trying to gain access.
This article may contain affiliate links. Click here for more details.