One of our readers, Yonathan, accidentally dropped his iPhone 3G into in the water, so he decided to dry up by putting it in a direct sunlight. When he switched on the iPhone, it actually shows a message ~ “Temperature” iPhone needs to cool down before you can use it”.

So I did a search on it and found this in Apple’s support page.

“Operate iPhone 3G in a place where the temperature is between 0° and 35° C (32° to 95° F). Low- or high-temperature conditions might temporarily shorten battery life
or cause iPhone 3G to temporarily stop working properly.

Store iPhone 3G in a place where the temperature is between -20° and 45° C (-4° to 113° F). Don’t leave iPhone 3G in your car, because temperatures in parked cars can
exceed this range.”

If the interior temperature of iPhone 3G exceeds normal operating temperatures, you may experience the following as it attempts to regulate its temperature:

• iPhone 3G stops charging
• Display dims
• Weak cellular signal
• Temperature warning screen appears with the message “iPhone needs to cool down before you can use it”

When the message appears, you should turn iPhone 3G off, move it to a cooler environment, and allow it to cool before resuming use. However, iPhone 3G may still be able to make emergency calls under this condition
Normally this “Temperature” message will appear when: Leaving iPhone 3G in a car on a hot day, leaving it in direct sunlight for extended amounts of time and using certain applications in hot conditions or direct sunlight for long periods of time, such as GPS tracking in a car on a sunny day or listening to music while in direct sunlight.

More pictures after the break.