Iphone 3g. 4.2.1 shuts down and freez if unpluged from charger

can anyone please help me , i have iphone 3g , 4.2.1 firm. if unpluged from the charger then the light turns off and if called from other phone it rings but dosnt show in the iphone that it rings. and then it freeze then after a while shuts down , your help will be appreciated thank u

yes , i did everything, even i restored it to factory setting and reinstalled firmware, but still the same problem. i asked someone who fixes fones and he said there is a hardware problem stil i dont know, i ordered a new battry i will try to change it mite work i dont konw. what do you think ?

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In order to troubleshoot this, I would recommend that you start with an SMC reset. Information on this procedure can be found here:
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Iphone 3g. 4.2.1 shuts down and freez if unpluged from charger

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