Reports has been appearing last week that the new iPhone 3GS could be prone to overheating. It remains to be seen if it is due to incorrect usage by users, a design defect on Apple’s part or a common problem to all smartphone devices.
Apple actually posted a support article last modified June 25 that offers tips on [how to keep iPhone 3G and iPhone 3GS within acceptable operating temperatures](http://support.apple.com/kb/HT2101).
Operate iPhone 3G and iPhone 3GS in a place where the temperature is between 0º and 35º C (32º to 95º F). Low- or high-temperature conditions might temporarily shorten battery life or cause the device to temporarily stop working properly. Store iPhone 3G and iPhone 3GS in a place where the temperature is between -20º and 45º C (-4º to 113º F). Don’t leave the device in your car, because temperatures in parked cars can exceed this range.