But they aren't normal operating conditions for the device. And perhaps your iPhone 4 happened to have a greater tolerance than the normal iPhone 4.
Keeping device within acceptable operating temperatures
Operate iOS devices 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 alter its behavior to regulate its temperature.
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.
iOS devices comply with the safety standard for Safety of Information Technology Equipment, IEC 60950-1, 2005 + A1: 2012. Many countries have adopted this safety standard. For example, it is referred to as:
- 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.