Apple may not be ready to confirm that the iPhone 3GS has an overheating issue, but they have posted advice on keeping the iPhone 3GS and iPhone 3G within acceptable operating temperatures. This advice includes not leaving the iPhone in the car or exposing it to direct sunlight for extended periods of time.
The advice also notes that certain applications should be avoided when in a car on a sunny day or when the iPhone is exposed to direct sunlight. These applications includes GPS and listening to music, which may effect anyone who want to go sunbathing or who is driving around in Texas.
Obviously, air conditioning is going to help offset any issues you have with the iPhone in the car, but if your air conditioner is out and it an especially hot day, be aware that this can effect the phone and avoid using it if possible. For sunbathers, putting the phone under a towel or somewhere with shade will help.
If your iPhone does begin to overheat, the device will take steps to offset it which includes dimming the display and a weak cellular signal. If it gets too hot, a screen will pop up telling you the iPhone must cool down before it can be used, though emergency calls can still be placed.
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Reports are coming in that the iPhone 3G S gets really hot. Oddly, not mine.
Over the weekend I read several reports from various sources claiming that the iPhone 3G S was getting abnormally hot — hot enough to discolor the case, apparently. I’m not saying that these reports are wrong, or somehow invalid, but I’ve been using my iPhone 3G S constantly and consistently for the past 16 days and haven’t noticed anything like this.

Perhaps I’m not doing something that others are doing, but last Friday I drove for an hour with my 3G S in a Belkin TuneBase. The iPhone 3G S was charging, playing MP3s, using GPS and the magnetometer, linked to both 3G and EDGE networks depending on availability, and making the occasional phone call via a BlueAnt Bluetooth speakerphone. I arrived at my destination, pulled the iPhone out of the dock and did not notice any heat issues whatsoever.
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