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Re:Why Johnny Doesn’t Use Two Factor – A Study of the FIDO U... by gruez on Friday August 10, 2018 @05:09PM (#17736753)
6s supports NFC for EMV only. 8 and newer has generic NFC support.

https://developer.apple.com/documentation/corenfc

Re:Why Johnny Doesn’t Use Two Factor – A Study of the FIDO U... by devinl on Friday August 10, 2018 @05:39PM (#17736935)
The "generic NFC" support you refer to is read only which means that protocols like U2F still don't work so usability of U2F for iPhone users is still not there (without bluetooth keys which have their own problems).
Re:Why Johnny Doesn’t Use Two Factor – A Study of the FIDO U... by dbb01 on Friday August 10, 2018 @07:29PM (#17737416)
The neo NFC works with iPhones 7 and above