Why is my iPhone 15 overheating?

This can happen due to background processes. Please force restart the iPhone to see if the issues persist

1. Press and quickly release the volume up button.
2. Press and quickly release the volume down button.
3. Press and hold the side button.
4. When the Apple logo appears, release the side button.

If your iPhone is shutting down with a temperature warning on the screen saying it can't be used until it cools down, then your iPhone is indeed overheating. If your phone is NOT shutting down, nor do you see a thermometer and warning on your screen, it is NOT overheating. Phones can run warm when being used, being charged, streaming video, playing games, using the internet, talking on the phone, surfing the internet using the camera to name a few things which can make your phone run warm.