How to get mobile number/email that is verified using facebook account kit in callback?

I am using facebook account kit for the first time for phone/email verification in my web app. I have followed http://ift.tt/2jolTHM for integration and it is working fine. Buy the only issue is the phone number that I send to account kit is editable in account kit popup.So how can know which phone number is used for verification.I don't see any information related to it in documentation or in response that I got in callback.

Is there a way to disable input box in account kit popup, so that I can be confident that the authentication response I get from account kit is related to same phone number that I sent? Or is there a way to get phone number that is used for verification as part of response from account kit?

Facing same issue with email verification aswell.