My phone just died and I don't know why?

I was out this morning I had my phone in my hand. I was taking photos and I went to take some more and my phone wouldn't turn on. Its an iPhone 5. I know that its not a lot of info to go on but if you know anything please tell me.

Try holding down the Power and Home Buttons together at same time for 15 seconds then it should reboot to apple logo

Umumumumumum

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