Handset

A handset is a component of a telephone that a user holds to the ear and mouth to receive audio through the receiver and speak to the remote party using the built-in transmitter.

A mobile phone does not require a base station and communicates directly with a cell site in designated frequency bands.

A graphic symbol that designates a handset is used on cordless and mobile phones to specify placing or ending a telephone call.

Usually a button with green upright (off-hook) handset icon is used for starting a call, and a red lying-down (on-hook) handset is used for ending a call.

[1] Unicode has the handset symbol U+1F4DE šŸ“ž TELEPHONE RECEIVER commonly faced rightwards to use with face emojis, and also symbols with specified direction: U+1F57B šŸ•» LEFT HAND TELEPHONE RECEIVER, and U+1F57D šŸ•½ RIGHT HAND TELEPHONE RECEIVER[2].

Classic handset
Woman using a telephone handset ( West Germany , 1988)
Early 20th century candlestick telephone which required only the receiver to be held to the ear (United States, 1920sā€“30s)