The telephone is a very simple device because the telephone connection that we have in our homes has not changed for almost a century. So it doesn't matter if you have a phone from the 1900s, if you connect it, it will work. The phone has only 3 parts, the switch (hook switch), the speaker and the microphone. The switch is used to connect or disconnect the phone from the network. The loudspeaker is used so that the person using it can hear. The microphone is used so that the two callers can communicate. Microphones are so simple that they are made of carbon granules between two metal plates. Most modern phones are equipped with a ringtone, a touch keypad and a frequency generator. Additionally, the microphone, instead of being made of carbon granules, is an electronic amplifier. The telephone has changed and evolved over the years, going from simple to more sophisticated. The first telephone was created on the basis of the telegraph. The telegraph had long been used to communicate, but the problem was that it could only receive or send one message at a time and it used Morse code. In 1874, Bell's father-in-law, Gardiner Green Hubbard, had the opportunity to break the monopoly of the Western Union Telegraph Company and gave Bell the financial assistance he needed to continue his work developing the multiple