You can quickly turn on the flashlight on your iPhone by using Siri or the Control Center, and adjust its brightness through ...

You can enable the flash on your iPhone while taking photos by opening the Camera app, tapping the Flash icon in the top-left ...

Once you turn it on, you'll get another option you can choose to turn on for flashing when iPhone is set to silent mode. And it's that simple to make your iPhone flash when ringing or getting a text.