HELP! My phone shutoff by itself and won't power back on!

My iPhone was fully charged and had been working fine all day. I just went to check emails on it and it is completely black. I tried to power it back on and nothing, not even when plugged into the charger. Why would this happen and how can I get it back on? Thanks.

try a reset, hold down the home/sleep button together until you see the apple logo and then release, then wait for the phone to boot back up.

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