You might notice that your device feels warmer in these situations:
When you set up your device the first timeWhen you restore from a backupWhen apps reindex or reanalyze data, like Photos tagging for faces, places, or keywords after a software updateWhen you use graphics-intensive or augmented-reality apps or features
Is it OK to put your iPhone on an ice pack? I have done this a few times, and I just have it wrapped in a cloth to keep moisture at bay.
But don’t do what one reader did and put their iPhone in the freezer to cool down, forget about it, and come back to it frozen solid. While that iPhone did thaw out and come back to life, home freezers temperatures hover around the minimum recommended storage temperature for the iPhone (-20º to 45ºC/-4º to 113ºF), and so this stunt could have damaged it.
An ice pack is a great solution because it the temperature won’t get anywhere near the lower end of the iPhone’s operating temperatures (0º to 35ºC/32º to 95ºF).
I’ve heard about this iCloud throttling issue a few times the past few weeks from new iPhone owners, and it perhaps suggests that the iPhone 13 may be more sensitive to thermal issues than earlier releases.