Some smartphone components that are not essential but may be included in some models are:

NFC (Near Field Communication): This technology allows for contactless communication between devices over short distances.

Infrared (IR) blaster: This feature allows the smartphone to function as a remote control for TVs and other IR devices.

Wireless charging: This feature allows the smartphone to be charged wirelessly using a compatible charging pad.

Dual-SIM support: This feature allows the smartphone to support two SIM cards, which can be useful for people who need to use different phone numbers for work and personal purposes.

Expandable storage: This feature allows users to expand the storage capacity of the smartphone using a microSD card.

Headphone jack: While this was once considered an essential component, some modern smartphones have removed the headphone jack in favor of wireless audio or USB-C headphones.

Haptic feedback: This feature provides tactile feedback in response to user input, such as when typing on a virtual keyboard or pressing a button.

LED notification light: This feature provides a visual cue when there are new notifications, such as missed calls or text messages.

These components can add functionality to a smartphone, but they are not essential for basic operation.
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