Some activities such as charging or a lot of computational activity (e.g., video), generate heat. Some warmth is to be anticipated.* ** "Keep your iPhone, the power adapter, and any wireless charger in a well-ventilated area when in use or charging.”*** Read this article about keeping an iPhone or iPad within acceptable operating temperatures - If your iPhone or iPad gets too hot or too cold - Apple Support
In terms of usage, changes in software such as upgrades or new apps may introduce new features which may add to power drain and heat generation. Check Settings > Battery to see if there are apps running that use a lot of power. If there are, decide if you can turn off a service such as Settings > General > Background app refresh when an app is in the background, or Settings > Privacy > Location Services. Read this support article to learn about the battery health feature —> iPhone battery and performance - Apple Support
If you have just updated system software, read posts about indexing in this thread: iPhone 15 overheating - Apple Community
An iOS update may require subsequent reorganization of files and a short term increase in heat and battery drain until the task is done. Wait a few days and see if the issue persists.
About Apple software updates - Apple Support
says: “Immediately after completing an update, particularly a major release, you might notice a temporary impact on battery life and thermal performance. This is normal, as your device needs time to complete the setup process in the background, including indexing data and files for search, downloading new assets, and updating apps.”
If you think there is a problem with a device, have Apple inspect it. Go to this page to find your nearest Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD) --> https://locate.apple.com/country
How to make a Genius Bar appointment
1. Go to Genius Bar Reservation and Apple Support Options - Apple
2. Go to "Get hardware help".
3. Select your hardware and continue selecting options requiring replacing parts until you see "Bring in for Repair"
4. Sign in with your Apple ID
*"Your iPhone might get slightly warmer while it charges." - from: How to use your MagSafe Battery Pack - Apple Support
iphone/important-safety-information-iph301fc905/ios
** Posts by contributor Lawrence Finch explaining the basic physics. iPhone 15 Pro heating up with protective … - Apple Community and this one about overheating Why is my iPhone overheating? - Apple Community
***Section about "Prolonged heat exposure" in this support article --> Official Apple Support
The people here do not work for Apple and neither does Apple respond here. I you wish to make a request of Apple, try Product Feedback - Apple
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