The telephone is a very simple device because the telephone connection we have in our homes has not changed for almost a century. So it doesn't matter if you have a telephone from 1900 that if you plug it in it will work. The phone only has 3 parts, the switch (hook switch), the speaker and the microphone. The switch is used to connect or disconnect your phone from the network. The speaker 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 granules of carbon between two metal plates. Most modern telephones are equipped with a doorbell, touch pad keypad and frequency generator. Furthermore, the microphone instead of being carbon granules is an electronic amplifier. The phone has changed and evolved over the years from simple to more sophisticated ones. The first telephone was created on the basis of the telegraph. The telegraph was used for a long time 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 help he needed to continue his work developing the multiple.