Iphone 4 just turned off and wont come back on

Was on the phone in my car on the handsfree, then all of a sudden got disconnected. looked at my iphone 4 and it switched off. got home and tried charging it up and nothing happened, then tried plugging it into my pc to do a restore or see if i get any life and nothing !
got no phone now and because you have to have a micro sim you have to de activate your regular size sim. so now got no sim to put into a normal phone.
please help someone ! aaaaahhhh !!

Hey guys,
I was with my friend who had the same problem with his iPhone 4 today and as I was researching the problem I tried all the tricks and nothing seemed to work.
Until I came across some info that suggested the problem was with a proximity sensor.
Basically his phone was on(when someone called it would ring on their end instead of going straight to voicemail), but not respond tto touch or anything.
So I held the power button and slid my finger across the screen as if to "switch" it off even though the screen was blank and waited before holding the button again to turn it back on.
Once I did this it booted back up as if nothing happened.
Hope this is the same problem, good luck.
-nortron

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