It's not just the screen, other parts have codes on them too, like the camera modules. I've seen similar markings going all the way back to the iPhone 4, although they use the Data Matrix format ...

A recent discovery highlighted that Android 13 might offer a quicker and faster way to scan QR codes. The new option would let users scan codes right from their lock screen or quick settings using ...

A QR code (short for Quick Response code) is a two-dimensional barcode that can be read by your smartphone camera. QR codes provide quick access to product information, promotions and other content.

You will see a red line across the screen. Zoom in on the QR Code. When the code is read, you'll hear a beep and the information contained in the QR Code will appear on your screen.

Hidden QR codes help Apple keep reported failures down There are actually two QR codes in every iPhone screen, and they are added to different points, at different stages of manufacture.