My iPhone has been compromised

Why do you think your device has been "hacked"? Because of all the security features Apple has around its equipment this is incredibly costly and difficult to achieve —> https://security.apple.com/blog/memory-integrity-enforcement/ Much more likely is your account may be compromised, giving another user access to your account on your hardware. Even account access is surrounded by a number of security features but is more easily compromised by hackers convincing people to reveal security information, or users not bothering with implementing Apple’s security features.

Read this document if you think your Apple Account has been compromised. --> If you think your Apple Account has been compromised - Apple Support

For iOS 15 or earlier, if you want to see if anyone else has access to your device or accounts, click here --> Checklist 1: Limit device and account access - Apple Support

For iOS 16 or later see how Safety Check on iPhone works to keep you safe. Safety Check for an iPhone with iOS 16 or later - Apple Support

Use the information in this document to check your Apple ID device list to find where you're signed in --> Check your Apple Account device list to find where you’re signed in - Apple Support

Related materials:

Personal Safety User Guide

Personal Safety User Guide - Apple Support

> open the Table of Contents and review the articles

A document with general information about security and your Apple ID --> Security and your Apple Account - Apple Support

Contact Apple for help with Apple ID account security. This page provides country-specific Apple Support contact information ➞ Contact Apple Support - Apple Support

try reading

If you think your Apple Account has been compromised - Apple Support

Your three replies are na to the OP. So, I have asked the Host to make it their own thread.