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How to scan QR codes from the lock screen in iOS 12

Ever since iOS 11, your iPhone and iPad have been able to detect a QR code in the camera frame, and pop up a banner at the top of the screen to open the link embedded within it. This is a great way to quickly extract the URL from a billboard, or from a particular nerdy lost-cat poster stapled to a utility pole. Now, iOS 12 brings a dedicated QR-scanning shortcut you can invoke right from your iPhone’s lock screen. Let’s see how to scan QR codes in iOS 12.

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