Apple's 6splus caller flash doesn't work, but it's a good flashlight. What happened?

This may be related to the flash setting of your camera. If the flash is set to automatic, the system defaults to not using the flash when the light is good.

There are two reasons why the iPhone does not light up after setting the incoming flash:

One is that the setting is unsuccessful.

The second is that the mobile phone does not lock the screen, and the screen can be locked to light the flash.

The solution is as follows:

Turn on the LED flashing prompt in the settings again.

Open Settings General.

Locate accessibility features and click.

Click enter to find the LED flashing reminder switch.

Lock the phone screen manually or wait for the screen to lock automatically.