Random 555/mac.com contacts added to iPhone

Unlike some Android devices, contacts are neither stored locally on an iPhone nor in the SIM. They are synced to an email account that you have Google, iCloud, AOL, Exchange, Outlook, Yahoo, or any Other

If you have a corporate email account added through a profile on your device, please check with your organization's system administrator.

1. Is this your corporate/organization/enterprise/School Management iPhone? Then please contact the system administrator of your corporate//organisation/enterprise/School Management
2. If it is your device, in that case, do you have any profile installed by your corporate/organization/enterprise/School Management?
   1. Erase the profile added by you. If you have installed a profile on your own, --> Install or remove configuration profiles on iPhone - Apple ...
   2. Please contact the system administrator of the organization who provided the profile to you

"Random 555/mac.com contacts added to iPhone: Just noticed several random contacts added to my phone, all have 555 area codes California addresses and @mac.com email addresses. Anybody else have this issue?"

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No. I am NOT having this issue.

Accounts Unknowingly Added to your iPhone:

When's the last time you changed your passwords?

A. Apple iCloud Contacts:

Secure your account: Change your Apple Account password, as someone may have accessed to your Apple Account. Go here: Change your Apple Account Password - Apple Support

B. eMail Address Contacts:

Secure your account: Change the password of your eMail accounts, and turn off Two-Factor Authentication, if an option for that account.

Edit...

and turn ON Two-Factor Authentication