Blaze

We doubt there's a phone user who has never missed a call in their life. Sometimes you just can't pick up the phone – when driving, when showering, or when your hands are occupied, to give a few examples. Then there are those times when you simply don't notice your ringing phone – it beeps, blinks, and vibrates vigorously, yet still can't draw your attention. While there's little that can be done in the former case, this nifty trick can help you avoid the latter situation. It is possible to make the LED light on your Android phone's camera blink when there's an incoming call, which should minimize the chance of you missing it.

And one more thing..
Change phone's flash as a torch from lock screen.
Just press power button followed by volume buttons two times.
Press volume button again to turn it off.