How Trend Micro QR Scanner Differs From Other Apps . The app I use is Trend Micro QR Scanner. It's a very simple QR code ...

Quick tip: If you don't see a notification pop up, make sure that you have the Scan QR Codes feature enabled. Open the Settings app and tap Camera, and then make sure Scan QR Codes is enabled.

Launch your iPhone's Camera app. You can do this directly ... your Lock Screen by long-pressing the camera icon. Hold your iPhone so that the QR code appears clearly in the viewfinder.