Many recent iPhone models, starting with the iPhone X, can use their front camera as a biometric security device. With Face ID, you can sign into your iPhone and authorize purchases just by looking at your phone. And it takes just a few moments to set up.
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How to set up Face ID on an iPhone
1. Start the Settings app and then tap "Face ID & Passcode." You might need to enter your passcode.
2. Tap "Set Up Face ID." (If you've set up Face ID before, tap "Reset Face ID."
3. Hold your phone in portrait, or vertical, orientation and tap "Get Started."
4. Make sure your face is positioned inside the circular frame and move your head in a small circle so the camera can see the sides of your face all around.
5. When the iPhone has scanned your face sufficiently, it will want to scan your face again. Tap "Continue" and follow the directions to scan your face a second time.
6. Tap "Done."
That's it – Face ID is now set up. You can control exactly how Face ID works by returning at any time to the "Face ID & Passcode" page in Settings. Here, you can choose to use Face ID to unlock your phone, to make purchases in the App Store, to use Apple Pay, and more.
It's also a good idea to make sure that "Requires Attention for Face ID" is turned on. This makes sure that your face can't be faked with something like a photograph.
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