My iPhone 15 Pro is overheating during calls

Update to iOS 17.0.3, it addresses the overheating issue.

About iOS 17 Updates - Apple Support

https://www.macrumors.com/2023/10/04/apple-releases-ios-17-0-3/

Hi mahendrafromlucknow,

We'd like to share some information to help regarding the temperatures of the device. We would recommend looking over If your iPhone or iPad gets too hot or too cold - Apple Support to see what expectations are set and if the device is having alerts or going beyond the acceptable operating temperatures you'll want to contact Apple Support to further look into this.

Thanks for using Apple Support Communities.