Many users have reported issues with the iPhone 15 series overheating while charging or when in use for extended periods | au Web Portal Economics/IT News

On the iPhone 15, iPhone 15 Plus, iPhone 15 Pro, and iPhone 15 Pro Max (iPhone 15 series) released in September 2023, the iPhone 15 Pro was noted to have issues such as the back glass being easier to break than before. It was. Several users have recently reported an issue with the iPhone 15 series where the device itself generates unusual heat when charging or when used for long periods of time.
iPhone 15 series overheating issues are appearing among early adopters
https://www.androidauthority.com/iphone-15-series-heating-issue-3367654/
Severe thermal throttling reported in Apple iPhone 15 Pro Max as A17 Pro appears to push surface temperatures to 48°C while gaming – NotebookCheck.net News
https://www.notebookcheck.net/Severe-Apple-iPhone-15-Pro-Max-thermal-throttling-reported-as-A17-Pro-appears-to-push-surface-temperatures-to-48-C- while-gaming.753143.0.html
Scratches, fingerprints, and overheating: iPhone 15 Pro users have a lot of complaints
https://www.indiatimes.com/technology/news/scratches-fingerprints-overheating-iphone-15-pro-615931.html
Early iPhone 15 Pro buyers complain about overheating, some report throttling and discoloration issues – Apple (NASDAQ:AAPL) – Benzinga
https://www.benzinga.com/news/23/09/34864785/early-iphone-15-pro-buyers-complain-of-overheating-some-report-throttling-and-discoloration-issues
The A17 Pro’s lower benchmarks may be the reason behind the iPhone 15 Pro’s thermal throttling issues – PhoneArena
https://www.phonearena.com/news/Lower-standards-for-A17-Pro-could-be-behind-iPhone-15-Pro-thermal-throttling-issues_id150917
Some users who got the iPhone 15 series released on September 22, 2023 reported an issue where the device becomes extremely hot while charging or when used for a long time. According to Android-related media Android Authority, the iPhone 15 Pro Max with iOS 17.0.2 generates excessive heat “when charging the device with a USB PD GaN charger that supports 65W output” and “when charging the device” with a USB PD GaN charger that supports Output 65 watts. This only applies in two cases: when you open a chat app or launch Reels on Instagram while using it for a long time.
“When charging the main unit using a USB PD GaN charger that supports 65W output” “iPhone 15 Pro Max gets uncomfortably hot” Without a case. Even if you have a case, you can still feel the heat through the case. However, it seems that this heat generation can be suppressed by using a charger with a lower output such as 15W.
In addition, since the iPhone 15 series has moved from a Lightning port to a USB-C port, it is necessary to select a USB-C cable with charging speed and data transfer speed in mind.
What you need to know about switching from Lightning to USB-C on the iPhone 15 series – GIGAZINE

The bottom of the main camera seems to get particularly hot when opening a chat app or playing an Instagram video while using the device for an extended period. “I can’t believe it’s generating so much heat even though I’m not playing a game, not charging, and just connected to Wi-Fi,” Android Authority wrote.
Even on the X, media reviewers and hardware influencers reported excessive heat generation in the iPhone 15 series.
“When I talk while charging my iPhone 15 Pro Max, the frame gets so hot that I can’t hold it in my hand,” 9to5Google writer Max Weinbach posted.
My charging 15 pro max got very hot around the frame while chatting and I can’t hold it down
Seriously, it’s too hot to hold while charging — Max Weinbach (@MaxWinebach) September 23, 2023

YouTuber Gadget Harsh Punjabi posted, “iPhone 15 Pro is generating a lot of heat. Damn, there’s clearly a problem with this smartphone. I didn’t expect Apple to cause such a problem.”
iPhone 15 Pro gets hot a lot. Damn this phone has problems. I didn’t expect Apple to drop the ball like this. – Harsh Punjabi (@technolobeYT) September 23, 2023

Snazzy Labs said: “The things I liked about the new iPhone 15 Pro from the first day I used it were: 1: Slightly curved edges” 2: 5x telephoto zoom (iPhone 15 Pro Max)” 3: The previous model 3 things I don’t like : 1: It gets hot quickly, 2: Battery life is incredibly average, and 3: The action button can only do one thing, which lists the pros and cons of the iPhone 15 Pro.
Favorite things about the new iPhone Pro after day one:
1. Slightly curved edges
2. 5x telephoto zoom
3. Much lighter than the previous model
Least favourite:
1. It gets very hot, very quickly
2. Battery life seems incredibly average
3. An action button can only do one thing — Snazzy Labs (@SnazzyLabs) September 23, 2023

Chiffon Salmon also posted: “iPhone 15 Pro Max is getting really hot. Looks like it’s going to catch fire just scrolling through social media.”
The iPhone 15 Pro Max gets very hot easily. I’m just scrolling through social media and it’s on fire. pic.twitter.com/BwaAkGzl6A – Shevon Salmon (@its_shevi) September 24, 2023

“The iPhone 15 Pro Max gets really hot, so you definitely need a case. It’s not like the device won’t even heat up unless you do something intense,” says Tommy, a tech creator. My favorite YouTuber “I hope the company tells me about The reason for this,” claiming that the device only heats up with normal use.
The iPhone 15 Pro Max gets so hot, you definitely need a case. You don’t even need to do anything intense for it to get hot 😂… I hope your favorite YouTubers tell you this — Tomi (@GadgetsBoy) September 24, 2023

Rjey, a tech creator, posted, “My iPhone 15 Pro Max gets so hot sometimes I can’t even hold it when I use it without a case.”
The iPhone 15 Pro Max sometimes gets so hot that if you use it without a case you won’t even be able to hold it. pic.twitter.com/cZ9dAA1186 — Rjey (@RjeyTech) September 23, 2023

As Ian Zelbo of Apple-related media site 9to5Mac posted: “My iPhone 15 Pro Max is too hot to touch while fast charging.”
Jeeez my iPhone 15 Pro Max is almost too hot to touch while fast charging rn… — Ian Zelbo (@ianzelbo) September 25, 2023

Even with iPhones other than the iPhone 15, it seems that the device is particularly likely to overheat within 24 hours after the initial setup. The reason is that all applications are initialized during the initial setup and login is done from there. However, it has been reported that even after the first 24 hours, the iPhone 15 series is still overheating.
Below is a thermal image taken with the thermal imaging camera after testing the iPhone 15 Plus and iPhone 15 Pro Max. The photo was taken by BullsLab, a Korean hardware YouTuber.
Below is a thermal image of the iPhone 15 Plus, the left side is the front side and the right side is the back side. The maximum temperature on the front side is 42.8 degrees, and the back side is very hot at 46.7 degrees.

Below is a thermal image of the iPhone 15 Pro Max, where the maximum temperature of the front side is 44.2 degrees and the back side is 46.2 degrees.

“We found that the iPhone 15 Pro and iPhone 15 Pro Max became abnormally hot, but this may be due to Apple’s lower benchmarks for the installed SoC A17 Pro. There is already,” technology media PhoneArena said.
The A17 Pro is a chip manufactured using TSMC’s 3nm process. Apple’s A-series chips used the 5nm process from 2020 to 2022. Due to changes in process rules, the A17 Pro is said to have a 10% faster CPU and 20% faster GPU than the previous generation A16 Bionic.
It was noted that defective products were occurring at a certain rate for the A17 Pro even before its release, and some suggested that Apple lowered standards for the A17 Pro. PhoneArena suggests that TSMC may have increased the wattage of the A17 Pro in order to achieve the performance Apple wanted. PhoneArena claims that this is the cause of excessive heat generation.
TSMC has entered into a “no claims contract for defective chips manufactured using the 3nm generation process” with Apple, why? -Gegazin

By Durham Business
However, as shown in the thermal image taken by BullsLab mentioned above, excessive heat generation has been confirmed on the iPhone 15 Plus as well. The SoC installed in the iPhone 15 Plus is the A16 Bionic, not the A17 Pro, so it would be premature to think that the excess heat is caused by the A17 Pro only.
Please note that as of the time of writing this article, no feedback has been received from Apple regarding the heat generation issue on the iPhone 15 series.