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For phone, Iris Scanners Are Good. Actually, In Phone, FPS is Enough for BioMetric Unlock. And I don't think Any of Biometric Unlocking Method Gonna replace Primary Security method i.e. Pin/Password as Biometrics Can Fail due to various Conditions.
All those Iris and Face Recognition is Nothing, Just a Boasting Method.
And I don't care For it. I still Use Primary Security method Over Biometrics in Phone.