What is the function of Touch ID on newer iPhone models?

The function of Touch ID on newer iPhone models is primarily to unlock the device and authorize payments using a fingerprint. This biometric feature allows users to securely access their devices without needing to enter a password or PIN. By using a fingerprint, Touch ID provides an efficient and user-friendly method for authentication, making it easier to access apps, make purchases on the App Store, and authorize transactions through Apple Pay.

The system captures and securely stores a user's fingerprint data, allowing for fast recognition when the fingerprint is presented. This creates a balance between security and convenience, as users can quickly unlock their phones or make purchases while also ensuring that their personal information is protected.

The other options do not align with the features offered by Touch ID. Enhancing battery life, taking photographs, and connecting to Wi-Fi are handled by other components of the iPhone’s functionality and do not relate to the purpose of Touch ID.