Scan a QR Code
It's now incredibly easy to scan a QR code with your iPhone. Instead o installing a third-party app, you can use the iPhone camera app to do it.
Just point your iPhone camera at a QR code and then after a second you will see a box at the top of your screen so you can tap on it to complete the action.
This could send you to the App Store, take you to a webpage, open a new email message and jump start other actions.