forget initial Apple ID & password for iPhone
I had reset my iPhone6 and I couldn't login with my Apple ID (which I was using before reset). And the email showing a strange email address to me. Seems another email address was registered in my iPhone initially. How can I use my Apple ID to login again? or How can I retrieve the full email address it shows (it is showing a******@gmail.com) so that I could find out who had logged my iPhone.
iPhone 6, iOS 11