FaceID, Touch ID, and Passcode

Depending on the model of your iPhone, there will be options for FaceID, Touch ID, and passcode under General Settings. You can update your FaceID, Touch ID, and passcode there. Always use a passcode on your devices to prevent anyone from accessing your device while unattended. iPhone 5s or later, iPad Pro, iPad Air 2, and iPad mini 3 or later all have Touch ID, which uses your fingerprint to access your device. iPhone X or higher has the FaceID option, which uses a mathematical model of your face to scan your face and access your device. In addition to Face ID and Touch ID features, you can set up a custom passcode that is either a 4–6-digit numeric code, a custom numeric code (longer than 4 digits), or a custom alphanumeric code (combination of numbers and letters). The more complex the passcode, the harder it will be for someone to guess.