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Hi, Lisa here and I'm going to show you how to use the flash LED for alerts on your iPhone. First you're gonna go to your settings, then you'll go to general, then accessibility, then you're going to scroll down, and you'll see LED flash for alerts. You go ahead and just turn that on, then you'll have it on. Now, the reason you might want to use this, you might have your phone face down on the table, and maybe it's silent and you want to know when it rings, so now with that on, when your phone is locked and the phone rings, you'll still see that flash to know that something's happening.
So there you go, that's how you can use your flash LED on youriPphone as an alert.