How to setup Biometric authentication on mobile devices

To enable Touch ID (Fingerprint biometrics) on iOS follow these steps:

1. Tap "Settings".
2. Tap "Touch ID & Passcode".
3. Enter your device unlock passcode (if you do not have a passcode setup you will be prompted to create one now).
4. Tap "Add a Fingerprint" and follow the prompts to enroll your fingerprint.
5. Optional: Repeat step 4 to enroll up to (5) fingerprints. 

Apple support reference article for Touch ID setup: https://support.apple.com/en-gb/102528

Face ID (Facial recognition) is available on the following devices:

• iPhone 11 Pro Max
• iPhone 11 Pro
• iPhone 11
• iPhone XS Max
• iPhone XS
• iPhone XR
• iPhone X

To enable Face ID, please follow these steps: 

1. Tap "Settings".
2. Tap "Face ID & Passcode".
3. Enter your device unlock passcode (if you do not have a passcode setup you will be prompted to create one now).
4. Tap "Set Up Face ID".
5. Follow the prompts to enroll Face ID.

Apple support reference article for Face ID setup: https://support.apple.com/en-gb/108411