It would make the ‘old’ phones a high demand item................
Actually, it probably would not impact the sales of phones ... it would not take away their ability to access the internet, but it would surge the demand for “old” cameras where you can turn the lens to manually focus them. It would also increase the demand for extremely high resolution cameras that could be given a fixed focal length so that autofocus could be turned off, and you could still get detail by zooming into the actual picture, rather than zooming the camera. In theory, the device would function much like a cell jammer ... emit a signal that overwhelms the IR sensor with information that the item being focused on is really really close. Instant blurred picture.