There are occasions when an application will have random glitches or issues, which might impact the phone's capabilities and operations. After installing flawed updates or introducing corrupted material, a program may misbehave. After making a few modifications to the program settings, particularly those related to display functions or screen resolutions, the same problem might sometimes arise.For example, when you've selected the incorrect choice for specific app display functionalities and then saved the most recent modifications you've made to that app, screen symptoms appear.

Similar display issues have been reported by several iPhone 6s Plus users, including screen flickering and a noticeable grey line on the upper half of the iPhone display. These symptoms are said to appear when using the iPhone 6s Plus camera app to take photographs or record videos and move between different camera modes. Other customers, in fact, have complained about the front camera flickering when taking a video. The camera app appears to be the only source of screen flickering. Perhaps there's a bug or a misconfiguration in the settings that needs to be fixed. When using FaceTime to make video conversations, exposure to artificial lighting might cause a similar screen flickering problem.

Meanwhile, other experts believe that the company's poor software optimization on the iPhone 6s Plus variations is more likely to blame for the display issues. Apple, rather than improving the software on this iPhone, has employed a hardware-based downscaling mechanism, according to reliable sources.

Another thing that might cause the same display problems on your iPhone is a faulty app.