Can my phone be hacked through Apple id

Does anybody else have access to your Apple ID or knows your Apple ID and password?

Have a look at this article:

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

John Appleseed is also an example for setting up personal data, used by Apple in their user guides.

Why do you think your iPhone was hacked?

No, if you haven't jailbroken your iPhone, it's not possible.

iPhone 6s Plus, iOS 13

IF you have an iPhone 6S Plus, you need to update your iPhone to iOS 15.7.5. 

Go to Settings -> General -> Software Update -> Download and Install.

You need about 6 GB device storage and good Service and/or Wi-Fi.

If they are On, turn Off Hotspot & VPN.

Charge the battery > 70%.

Go to Settings -> General -> Software Update -> Download and Install.

See the following Apple articles:

Update your iPhone, iPad, or iPod touch

Update your iPhone, iPad, or iPod touch - Apple Support (IN)

If your iPhone, iPad or iPod touch won’t update

If your iPhone, iPad, or iPod touch won't update - Apple Support

You can do the update via PC, see this Apple article: Update software on iPhone, iPad or iPod touch in iTunes on PC

Update software on iPhone, iPad or iPod touch in iTunes on PC – Apple Support (UK)

If you have a Mac see this Apple article: Update your iPhone, iPad, or iPod touch with the Finder

Update your iPhone, iPad, or iPod touch with the Finder - Apple Support 

In recent help articles Apple seems to have changed the name into "Jane Appleseed"

copied from: If you forgot your Apple ID email address or phone number - Apple Support