How to know if my iPhone is hacked?

The chances of your phone being "hacked" are remote in the extreme. Not even the FBI could hack an iPhone. What is more likely is you are seeing something that is normal behavior but you do not understand. You need to describe to us what makes you think your device is being used by another person. If anything is compromised, its a lot more likely your ID, not the device itself.

Read this document if you think your Apple ID has been compromised. --> If you think your Apple ID 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 --> See who has access to your iPhone or iPad - Apple Support

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

Related materials:

Personal Safety User Guide

Personal Safety User Guide - Apple Support

> open the Table of Contents

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

Contact Apple for help with Apple ID account security by clicking on this link --> Contact Apple for help with Apple ID account security - Apple Support "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues."

Chilman1972 Said:

"How to know if my iPhone is hacked?: I believe my phone is hacked or at times someone is in my phone"

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About a Hacked iPhone:

Unfortunately, there is no way to determine if it has been hacked, unless you know that it has been jailbroken. And, the only way for an iPhone to have hacked is if it has been jailbroken. And if you purchased It anew from Apple, then no worries there.

So, what to do...

Resetting to Factory Settings:

If you are so concerned, then reset you iPhone to factory settings, as if you were to sell it. Go here: What to do Before you Sell, Give Away, or Trade in your iPhone, iPad, or iPod touch - Apple Support. Perform as instructed there, including the backup creation and iCloud logout.