How to unlock my iPhone 6s plus

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 and have encountered the activation lock, click here and submit an unlock request.

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There are 2 Support Articles to assist you.

If you forgot your Apple ID email:

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

If you forgot your Apple ID Password:

If you forgot your Apple ID password - Apple Support