Use iOS devices where the ambient temperature is between 0º and 35º C (32º to 95º F). Low- or high-temperature conditions might cause the device to change its behaviour to regulate its temperature. Using an iOS device in very cold conditions outside of its operating range might temporarily shorten battery life and could cause the device to turn off. Battery life will return to normal when you bring the device back to higher ambient temperatures. Using an iOS device in very hot conditions can permanently shorten battery life.
Store the device 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.
Your device might get warm
When you use the device or charge the battery, the device might get warm. You might notice that your device feels warmer in these situations:
- When you set up your device the first time
- When you restore from a backup
- When apps reindex or reanalyse data, like Photos tagging for faces, places, or keywords after a software update
- When you use graphics-intensive or augmented-reality apps or features
These conditions are normal, and your device will return to a regular temperature when complete.
Here are some of the higher ambient-temperature conditions and activities that might cause the device to change performance and behaviour:
- Leaving the device in a car on a hot day.
- Leaving the device in direct sunlight for an extended period of time.
- Using certain features in hot conditions or direct sunlight for an extended period of time, such as GPS tracking or navigation in a car, playing a graphics-intensive game, or using augmented-reality apps.
If your device gets too warm
If the interior temperature of the device exceeds the normal operating range, the device will protect its internal components by attempting to regulate its temperature. If this happens, you might notice these changes:
- Charging, including wireless charging, slows or stops.
- The display dims or goes black.
- Cellular radios enter a low-power state. The signal might weaken during this time.
- The camera flash is temporarily disabled.
- Performance slows with graphics-intensive or augmented-reality apps or features.
Additionally, if you're navigating, the device might show this alert and turn off the display: "Temperature: iPhone needs to cool down". Navigation still provides audible turn-by-turn directions. When approaching a turn, the display will illuminate to guide you through the turn.
If you see a temperature warning screen
If the device exceeds a certain temperature threshold, it will present a temperature warning screen similar to this:
An iPhone showing this message might still be able to make emergency calls.
To resume use of your device as quickly as possible, turn it off, move it to a cooler environment, and allow it to cool down.
About the safety standard
iOS devices comply with the safety standard for Safety of Information Technology Equipment, IEC 60950-1. Many countries and regions have adopted this safety standard:
- 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.