But one thing it's not packed with is a fingerprint sensor. Instead, the X is relying only on the new "Face ID" facial recognition feature for biometric security. Face ID on the iPhone X uses a "TrueDepth" camera setup, which blasts your face with more than 30, infrared dots and scans your face in 3D. Apple says this can "recognize you in an instant" and log you into your phone. This is not the first phone we've tried with a facial recognition feature, and they all have the same problem.