iPhone 15 Overheating Fix: Thermal Imagers Show Before and After iOS 17.0.3

The iPhone 15 overheating issue was confirmed and visualized using thermal imaging, and now the same technology is being used to show the impact of a software fix Apple.

According to our own survey, 57% of 9to5Mac readers with iPhone 15 models experienced overheating issues …

Overheating iPhone 15

We first started seeing widespread reports of this issue shortly after people received their new iPhones. Some users, including our own Ian Zelbo, found that their phones were too hot to handle under the same circumstances.

My iPhone 15 Pro Max is almost too hot. hot to the touch while fast charging right now. I thought people were exaggerating, but no, it's not good.

According to our survey, a total of 57% of readers with iPhone 15 models encountered this problem:

  • During charging: 19%
  • With heavy use: 11%
  • With normal use: 27%

Apple Fix

Apple has confirmed the problem, but denied reports that it has anything to do with changing the Pro model's chassis from stainless steel on titanium. Indeed, according to the company, the latest models actually have better heat dissipation than previous iPhones.

The iPhone maker told us it's a mixture of a bug in iOS 17 and problems with apps like Instagram and Uber. which put a lot of stress on the phone, causing the temperature to rise.

Apple has released a fix for iOS 17.0.3.

This Update contains important bug fixes, security updates, and fixes an issue that can cause iPhones to get hot stronger than expected.

Some worried that the company may have limited the performance of the A17 Pro chip in order to achieve this, but bench test results showed no signs of this.

Thermal imaging before and after

Objective data on the problem was obtained using a Forward-Looking InfraRed (FLIR) camera, also known as a thermal imaging camera. This not only provided a visual indication of heating, but also showed specific measured temperatures that were significantly higher than competing phones.

ZDNet used the same temperature measurement kit before and after installation. iOS 17.0.3. This confirmed that the update did indeed fix the problem.


I used a thermal camera to measure the temperature and found that the iPhone 15 Pro The Max reached 107.1 degrees Fahrenheit. It was much hotter than other iPhone and Android phones, which in my tests typically topped out at 85 to 95 degrees when fast charging. The hottest of all the other phones when tested under the same conditions was the Samsung Galaxy Fold 5, which reached 98.7 degrees Fahrenheit.


I downloaded the iOS 17.0.3 update and let my iPhone 15 Pro and iPhone 15 Pro Max test devices drain their charge, then plugged them in to fast charge using the same settings and the same hardware in the same location as in my previous tests. This time they never became more than slightly warm to the touch or rose above 93.8 degrees Fahrenheit. They stayed between the high 80s and low 90s – — A significant improvement over iOS 17.0.3, where two iPhone 15 Pro models consistently exceeded 100 degrees Fahrenheit when fast charging with a 35W charger.

Visual results can be seen in the photo above.

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