Lot of people complained about the heating problem in the new iPhone 3GS after they got their hands on it. They observed that their iPhone gets more hot than usual when extensive graphics applications are used. This is a serious problem isn’t it?
Apple has published an article on overcoming such a heating problem. According to the article:
-Operate iPhone in a place where the temperature is between 0º and 35º C
-Store iPhone in a place where the temperature is between 20º and 45º C.
-Don’t leave the iPhone in your car, because temperatures in parked cars can exceed this range.
If the interior temperature of the device exceeds normal operating temperatures, you may experience the following as it attempts to regulate its temperature:
-The device stops charging
-Display dims
-Weak cellular signal

Temperature warning screen appears with the message “iPhone needs to cool down before you can use it“. This message appears when the operating temperature has become too hot. This is a safety mechanism that protects the components of your device. If this message appears, you should turn the device off, move it to a cooler environment, and allow it to cool before resuming use.
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I was wondering for my new iPhone as heating problem i faces before. But now according to your tips. It working fine.