What could have caused my iPhone to shut off & stop working?

I was listening to music, unplugged it & the whole phone shut off. Nothing works. I've never dropped it in any water before. It's been dropped but I think everyone's phone has before. It always had a case on & there were no shatters ever. It was in new condition. I have no idea what happened. Also will apple replace my phone if i still have warranty or will they just send it back broken.

Did you try recharging it or maybe even reboost/ restart it?

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