Iphone 4 SUDDENLY TURNED OFF

My iphone 4 suddenly turned off!
it had above 70% charge and just 5 10 mins before it got off, i was using it, a call had come i just picked and then rejected in 2 seconds. After that i left it on the back seat of the car and after sometime when i got it, it just wouldnt turn on.
i even put it on charge for like some mins and still it doesn't work.
its all BLACK. I also held the power button for more than 1 min and still no changess.
it wasn't wet or anything. I just don't know what suddenly happened

My iPhone 5 won't up date to iOS 7?

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Does anyone know what I can do to make my Wi-Fi work again?

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