Samsung had the most secure face unlock on Android, then abandoned it
Rather than type in a password or PIN countless times daily, smartphone users turn to biometrics for device unlock. Your face and fingerprint are unique to you and are generally difficult to replicate, making these kinds of biometric security both convenient and safe. However, biometric sensors aren't all equal — some are easier to trick than others, making them less secure. Facial recognition is notoriously hard for smartphone manufacturers to implement without a dedicated depth sensor.
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