What if there is a black line on the screen of Apple's mobile phone?

There may be the following reasons for the black line on the screen of Apple's mobile phone.

Screen damage

If the other parts of the phone are used well after the black line appears on the phone screen, it may be that the phone screen is broken or crushed, and the phone screen needs to be replaced.

The thread is loose.

Open it and see if there is a black line. If there is, the screen must be broken, and a new screen can solve it.

Software problem

A software problem may have caused the black line to appear on the screen.

External extrusion

It may be squeezed by external force, which may damage the LCD screen and frame, or it may come into contact with liquid, resulting in this black line on the mobile phone screen.