After analyzing various smartphone models and their functionalities, here are some components that might be optional or not essential for basic smartphone functionality:

Front-facing camera - while this is a common feature in most smartphones, it is not essential for basic phone functionality.

Fingerprint scanner - though it enhances phone security, it is not necessary for basic phone operations.

NFC - Near Field Communication is used for contactless payments and file sharing, but it is not an essential component of a smartphone.

Wireless charging - traditional wired charging is still a basic requirement for smartphones, and wireless charging is an added convenience that is not essential.

Dual-camera setup - While it enhances the camera's capabilities, a single camera is still sufficient for basic smartphone functionality.

Note that some of these features may still be important to certain users, but they are not essential for basic smartphone functionality.
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