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A telephone transmitting/receiving unit comprising an electronic circuit having a function of converting a signal received by an antenna to signal to be outputted by a speaker, a function of converting a signal inputted by a microphone to a signal to be outputted by the antenna, a function of perfor

A telephone transmitting/receiving unit comprising an electronic circuit having a function of converting a signal received by an antenna to signal to be outputted by a speaker, a function of converting a signal inputted by a microphone to a signal to be outputted by the antenna, a function of performing prescribed processing, based on a signal from an operational unit, a function of generating a signal to a display unit, a cartridge removably loaded in a slot formed in the mobile communication terminal, and an input/output unit for inputting/outputting a signal to/from the mobile communication terminal is loaded in the mobile communication terminal. The telephone transmitting/receiving unit is loaded in the mobile communication terminal, whereby mobile communication can be performed by the use of the mobile communication terminal. The telephone transmitting/receiving unit is applicable to various types of mobile communication terminals, so that comfortable mobile communication can be provided corresponding to a time, place and occasion without contracting a plurality of circuits but by contracting one circuit.

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[ What is claimed is:] [1.]1. A telephone transmitting/receiving unit, comprising:an electronic circuit adapted to convert a signal received by an antenna to a voice signal to be outputted by a speaker, said electronic circuit being adapted to convert a voice signal inputted to a microphone to a tra

[ What is claimed is:] [1.]1. A telephone transmitting/receiving unit, comprising:an electronic circuit adapted to convert a signal received by an antenna to a voice signal to be outputted by a speaker, said electronic circuit being adapted to convert a voice signal inputted to a microphone to a transmitted signal to be outputted by the antenna, said electronic circuit being adapted to conduct prescribed processing based on an operational signal from an operational unit, said electronic circuit also being adapted to generate a display signal to be displayed in a display unit and said electronic circuit providing a single contracted circuit for a telephone system, wherein the single contracted circuit is associated with a unique identifier such that the identity of the telephone transmitting/receiving unit is known within the telephone system;a cartridge which includes the electronic circuit, wherein the cartridge is adapted to be removably loaded in a slot formed in a mobile communication terminal such that the electronic circuit is coupled to the mobile communication terminal, and wherein the cartridge must be loaded in the slot in order for the mobile communication terminal to perform a transmitting and receiving function using the contracted circuit, wherein said cartridge is formed so that said slot could receive the overall length of the cartridge to conceal the cartridge of the telephone transmitting/receiving unit from the outside; andan input/output unit included in the cartridge, said input/output unit being adapted to input/output a signal to/from said mobile communication terminal.