iPhone 3G, iPhone 3GS, iPad: Keeping device within acceptable operating temperatures Last Modified: April 15, 2010 Article: HT2101 iPhone 3G, iPhone 3GS, iPad: Keeping device within acceptable operating temperatures Summary Learn about the operating temperatures and temperature management of iPhone 3G, iPhone 3GS, and iPad. Products Affected iPhone 3G, iPhone 3GS, iPad Operate iPhone 3G, iPhone 3GS, and iPad in a place where the temperature is between 0Âº and 35Âº C (32Âº to 95Âº F). Low- or high-temperature conditions might temporarily shorten battery life or cause the device to temporarily stop working properly. Store the device in a place where the temperature is between -20Âº and 45Âº C (-4Âº to 113Âº F). Donâ€™t leave the device 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: 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" or "iPad needs to cool down before you can use it" (see image): 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. Note: When this message appears, the device may still be able to make emergency calls. Some conditions and activities that may activate the Temperature warning message: Leaving the device in a car on a hot day. Leaving it in direct sunlight for extended amounts of time. Using certain features 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. Safety Standards: iPhone 3G, iPhone 3GS, and iPad comply with the safety standard for Safety of Information Technology Equipment, IEC 60950-1. This safety standard has been adopted by many countries and is referred to as the following: UL 60950-1 in the United States CSA 60950-01 in Canada EN60950-1 in Europe AS/NZS 60950:1 in Australia and New Zealand.