"iPhone locked to owner"

Check your web browser autofill entries, the Keychain, and other records, or use Apple's iForgot service, or contact their Account Security team, or if you're the unit's original owner, click here and submit an unlock request.

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You used your Apple ID and Password to post on this user to user support site.

Your Apple ID is your email address. If you have forgotten the password.....

If you forgot your Apple ID password - Apple Support