My iphone keeps turning off?

Okay, so when I got on the bus to come home from school I tried opening my IPhone and it didn't open. I thought that it was just the battery but then when I came home I plugged it in and started charging it. It automatically opens when you charge it, right? Well, it was opening but the minute it came to my passcode it just turned off. Is it fixable or?

Take it to the nearset service centre. Don't try things yourself as you can void the warranty

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